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  1. #1
    Supporting Member Diseazd's Avatar
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    Default New engine

    I'm building a new engine. I'll use the L28 N42 block bored .040 over with an L24 crank and rods, L28 P79 flat-top pistons and a high quench P79 head shaved and shimmed .080 inches (should be 9.2 to 1 C/R). What this will be is a very over-bored L24 because I really like the higher revving L24's and bigger is always better.....right? Anyone build this motor before or heard of anyone else building it? I'll update as I build on.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

  2. #2
    Semi-retired admin Arne's Avatar
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    Plenty of people have thought about it, but I can't recall anyone actually doing it. Keep us posted!
    Arne - Former owner, HLS30-37705, 7/71, 905 Red
    Car blogs - 240Z - Porsche 911

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    Nova Scotia,Canada,Earth Blue's Avatar
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    Clever configuration!

    Goos Luck
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


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    Registered User Walter Moore's Avatar
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    Sounds Interesting.
    '71 240Z, Because any fool can drive fast in a straight line.

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    ..................nothing to the cam?
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


  6. #6
    Supporting Member Diseazd's Avatar
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    Isky Stage II........480 lift......Stainless steel swirl valves.......balancing the bottom end.
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Registered User Travel'n Man's Avatar
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    Guy -
    You've gotta try some triples on one of your engine - it is a total surprise on how much more power and torque you can generate out of a solid rebuilt engine. My power band is 2000-5500 rpm and it is F'n fantastic!! Todd at Wolf Creek really does a great job on his Mikuni's!
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


  8. #8
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    Hi Guy,

    Sounds like a great combo of parts there buddy. Should be a very nice revver. Please don't put a stock damper and flywheel on the beast will you?

    The L24 revs well because of the rod to stroke ratio as you're aware. I've just screwed together my new L28 and thought long and hard about those sorts of details so that's why I had custom rods built to suit my JE forged 300ZXTT pistons. Now I have an L28 with a 1.72 rod to stroke ratio (and a bit closer to your much better 1.8 than the original L28's 1.64).

    All the best mate. Let us know how it all progresses.

    Cheers.

    Ps I have an L20A crank and spare N42 block and......
    Last edited by ozconnection; 05-31-2011 at 05:57 AM.
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Registered User five&dime's Avatar
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    Quote Originally Posted by Travel'n Man View Post
    Guy -
    You've gotta try some triples on one of your engine - it is a total surprise on how much more power and torque you can generate out of a solid rebuilt engine. My power band is 2000-5500 rpm and it is F'n fantastic!! Todd at Wolf Creek really does a great job on his Mikuni's!
    Mitchell... I have been barking up that tree for years now!!! I don't know how to get him to just give in and get some triple mikuni's etc... The 510 was awesome with them. Would have been a total bore with SU's. Maybe if you all chime in it will help convince him. I mean 4 z's with SU's is too much. We need something different in at least one of them! Afterall, I did convince him not to paint the safari gold car silver. And I convinced him to go 16" panasports on all instead of 15".

    Let's get a petition going. Triple carbs FTW!!!!

  10. #10
    Supporting Member Diseazd's Avatar
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    OZ......You know I'm building this motor because of our conversation last year! The P79 head shaved and shimmed gives a ratio of 9.2 to 1 while the E31 gives you 9.7 to 1. I have both heads available, but decided on the P79 for the better burn and flow. Do you agree? This engine ought to be a sweet driver.......we'll see. Guy
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

  11. #11
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    Brandon -
    He rolled right over my post........it didn't even phase him! He may be a little overfocused on this rebuild - but, if he drove a triple Mikuni it would bring him right into the drivers seat in a hurry - he wouldn't know what to do with all that torque and power from a little straight line 6 - SU's are fine but nothing like triple Mikuni's!! You guys need to get out of that Richmond heat and drive down the Blue Ridge Parkway (or should I say up / elevation 3500 ft) and come and drive my Z - I promise you it will put a smile on your pops face!!

    There is no better feeling than to pull a mountain with twisty's with my L28!

    Open invitation Guy - what do you have to loose other than the heat of Richmond!!
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


  12. #12
    Supporting Member Diseazd's Avatar
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    Mitchell.......I didn't mean to pass over your post.....I just love the simplicity of my SU's. Besides that.....come to Richmond and drive mine......you might be surprised at the power and torque my 3 L28's make and the two L24's to boot. Each to his own....I love my motors ......don't be too sure you're making more power than mine! Guy
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

  13. #13
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    Brandon -
    He rolled right over my post........it didn't even phase him! He may be a little overfocused on this rebuild - but, if he drove a triple Mikuni it would bring him right into the drivers seat in a hurry - he wouldn't know what to do with all that torque and power from a little straight line 6 - SU's are fine but nothing like triple Mikuni's!! You guys need to get out of that Richmond heat and drive down the Blue Ridge Parkway (or should I say up / elevation 3500 ft) and come and drive my Z - I promise you it will put a smile on your pops face!!

    There is no better feeling than to pull a mountain with twisty's with my L28!

    Open invitation Guy - what do you have to loose other than the heat of Richmond!!
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    Quote Originally Posted by Diseazd View Post
    OZ......You know I'm building this motor because of our conversation last year! The P79 head shaved and shimmed gives a ratio of 9.2 to 1 while the E31 gives you 9.7 to 1. I have both heads available, but decided on the P79 for the better burn and flow. Do you agree? This engine ought to be a sweet driver.......we'll see. Guy
    Ooooops, yes I do remember now that you mention it....I'm gettin old mate

    Yes it's a lovely engine concept, I completely endorse it

    The P79 has a nicer more modern chamber shape and what you've done to it, it'll sing. A 2.4 L capacity with a 280 head et al equals awesome!
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Nova Scotia,Canada,Earth Blue's Avatar
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    Maxima N47 head will work nicely too.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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    Express Japanese Taxi ozconnection's Avatar
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    Quote Originally Posted by Blue View Post
    Maxima N47 head will work nicely too.
    True, you wouldn't need to shave the N47 but it has 42mm inlet valves. The exhausts are the same size and the ports both have liners.

    A suitable alternative with minimal work. I don't have a P79 at home but I do have an N47........thanks mate for reminding us of a suitable option
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

  17. #17
    Nova Scotia,Canada,Earth Blue's Avatar
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    Dang I would swap you for the N47. I have a P79 here as well as N47 E31's and some N42's.... but we are nearly on opposite sides of the planet

    Latitude: 44 38', North.
    Longitude: 63 35', West

    I am looking forward to hearing how your build goes. A guy going by Zolorin on Zcar.com did a similar awhile ago but I never followed closely.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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    Lat 33 deg 46 min south
    Long 150 deg 55.9 east

    Yes, isn't it lucky we don't live on a planet like Jupiter....imagine postage costs!
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

  19. #19
    Brian
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    Brandon...maybe when he see's the triples I have coming from Rebellos he'll change his mind. Time to give up simplicity for a minute and go for that extra little bit.

    Brian

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    Registered User tlorber's Avatar
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    Blue, what the deuce is going on the that avatar? Now you've simply gone too far!

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    Sounds like a cool build and +1 for the l24 revers! I am curious that you didn't go bigger on the cam-if your really into revving. After reading many posts from folks like Jon Morteson and reading about racer brown cams it seems these engines really want the duration and lift from a bigger cam-and they still drive civil.

    As far as the SU/Mikuni debate, I am starting to agree that these engines-when modified-need the Mikunis to wake them up. i will soon be taking my L24 to the dyno again to see what i can get out of my SU's with my best tune, then the Mikunis(40's) go on and the comparision will begin. I want to see the numbers and don't want to rely on the butt dyno.

    keep us up to date!!!
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Supporting Member Diseazd's Avatar
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    Thanks Steve........I've got the Stage III cam in my L28's........I was trying to move this down a little in the power band. The Stage II is .480 lift while the Stage III is .490 lift and 10 degrees more duration than the II. With a 9.2 to 1 C/R I figured the shorter duration would work better........maybe, maybe not. We'll see how this combo works......I'm really excited about this motor. Guy
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Guy-
    I'll tell you a hot combo - pull the SU's from your L28 with the Stage III cam - give that new L24 the SU's from the L28 and put Mikuni 44's on the L28 with the Stage III cam...........hot mama!! That would be one torque'n SOB! Totally bitch'n show and go!!
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    Supporting Member Diseazd's Avatar
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    Mitchell......You guys are really putting the heat on.....You,Brandon and now Brian(PJOE)......where is Bruce Palmer when I need him? Seriously these cars really pull strong to redline with the SU"s.......but who know's.....maybe someday. guy
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    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Supporting Member Diseazd's Avatar
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    The engine was hot tanked and bored .040 over.......It's ready for paint and brass plugs.
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    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Supporting Member Diseazd's Avatar
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    ........paint and an L24 crank in an L28 block.....spins smoothly!
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    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Great stuff mate! Lookin' good......
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Supporting Member Diseazd's Avatar
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    Thanks OZ......by the way, what gasket did you use on your 71 with the N42 block and P90 head? Did you use an N42 head gasket or a P79 head gasket? You basically have the same combo as mine and I wasn't sure which gasket to use. Guy
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Yeah, our combo's are similar.

    In Australia, we never got either the P90 or P79 L28 heads. We only ever saw the N42 head and as such the gasket is for an N42 head. What I used was a genuine Nissan gasket made by Nissan. There were some Nissan HG's sold here that were made by local manufactures but sold by Nissan as genuine.

    Funnily, they still have the stamps of the other manufacturer on them.

    PS More pictures of your engine please Guy!
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    The entire rotating assembly of a newly rebuilt engine reminds me of the insides of a fine watch , only a little bit larger parts.

    Great work.

    Bonzi Lon
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    Supporting Member Diseazd's Avatar
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ID:	46041 Added the L24 rods topped with .040 over L28 flat-top pistons this morning.
    Last edited by Diseazd; 06-11-2011 at 09:17 AM.
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    That looks fantastic Guy!

    Brass and steel core plugs?

    Reminds me of my engine, complete now, just waiting on the correct balancer to arrive and in she goes....
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    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Supporting Member Diseazd's Avatar
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    Nice engine OZ......well done. Is that the N42? I'm just waiting on the Z Doc to finish working his magic on my P79 head. Then I'll have to geometry the rockers and she'll be ready for final assembly. Good eye on the freeze plugs.......you win a new set of " Roo Bars"!! Guy
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Hey, the front bars on my Cedric ARE Roo Bars (they're big enough), a second set would be nice. Thanks!

    Yeah, it's an N42 block like yours.

    Have fun with the construction phase mate.

    Cheers.
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Hello Guy..........what's the latest on your engine buddy........updates please?

    I've got my engine in, run it in and have taken it out to the track for some action already!

    Oh, you'll love your engine if mine is anything to go by.

    http://youtu.be/nMcCqok4Co4

    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Happy New Year OZ! The engine is ready to assemble. The P79 head was shaved .080 inches and shimmed. SS swirl valves, Stage II Isky cam installed and I completed all of the rocker geometry work. It's a winter project and I haven't been pushed to finish the project since I really don't have a car to put it in (all 4 of my Z's have new engines in them already), but when I do finish it I'll pull an engine to install this mystery motor. Good hearing from you mate! Your engine sounds great. Guy
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    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    ...and a Happy New Year to you and yours Guy!! Cheers mate

    The head combo sounds very solid indeed. I've read about that head mod and it seems to be a great idea, a more modern chamber WITH a higher compression ratio. Awesome. Were the SS valves oversized?

    Trust me, you'll be itching to put that 'mystery motor' in ASAP.

    I couldn't tell you I'd been to the track without showing you. It's moves along nicely with 8.3 compression and a stock "A" grind cam though. Can anyone say 'turbo'

    Last edited by ozconnection; 12-31-2011 at 05:42 PM.
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    I always enjoy reading about your projects Guy. This engine project has been particularly timely because I am starting to plan my own build. Would you mind sharing some of the other details and choices you made such as- main and rod bearing brand/model, piston brand, and if you used Nissan flat top pistons what brand rings did you choose, rocker arm choice, etc? Which head gasket did you decide on?

    Thanks for sharing your build.

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    Jonathan.....I always use Clevite main and insert bearings........just heard good things about them from people whom I respect. The pistons in all of my motors are flat top Nissan with Nissan rings (Total Seal are excellent also). Head gaskets are Nissan with Turbo head bolts from MSA. If you get a cam ground, Isky is tops IMO. It's important to use an oil with zinc......I use Valvoline Racing Oil VR1.......good insurance. Rocker arms can be shipped to Delta Cams to be reground.....$4.00 each.....they'll come back like new. If you have any other questions, just let me know. Good Luck. OZ......Turbo....Nice!
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Quote Originally Posted by Diseazd View Post
    It's important to use an oil with zinc......I use Valvoline Racing Oil VR1...
    I've found that a lot of the Porsche crowd favors Brad Penn oil, even over the VR-1 (which is a close second choice).
    Arne - Former owner, HLS30-37705, 7/71, 905 Red
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    Yeah Arne, I've just changed from Brad Penn break in oil which is a straight 30 grade to their multigrade 20w-50. I'm like Guy and was looking for a semi synthetic oil with a high zinc content. Oil consumption hasn't been an issue and I'm very happy with it.
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    The P79 head shaved, shimmed, rocker geometry centered and ready for installation. Note shims under cam towers.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Progress......Now that I've got a car for the motor, I'm moving forward. This motor will go in the 918 orange 72.
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    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Its gonna be sweet. Now we can go for cruise in old looking cars versus all the brand new Z's....at least until this one gets a little makeup.

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    Looking good! I almost forgot you had this project going on.
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Looking great Guy. Keep the pics coming.
    Jeff
    Northville, Michigan
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    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
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    Without having to look it up, where does that put the pistons are far as deck height?
    What HG are you using?
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Getting closer now....
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Steve......I'm running the Nissan N42 head gasket......."0" deck height (I shaved .020 inches off the flat tops).
    Last edited by Diseazd; 07-22-2012 at 03:45 AM.
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    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Guy, that is beautiful!

    I cannot wait to see a video of it firing up! Bravo!
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

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    Guy -
    I gotta ask - triples on this one? You're building a perfect engine to bolt those bad boys on!
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    Mitchell......I did cave to a Stage III cam........I notice quite a difference between the II and III.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    ........a few more items added.
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Quote Originally Posted by Diseazd View Post
    Mitchell......I did cave to a Stage III cam........I notice quite a difference between the II and III.
    Guy,
    Was there much difference (and you may not be able to answer this yet) in the idle noise level - and much more torque - what is your RPM band with that cam?
    Life's a journey; enjoy the ride!

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    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    Both cams idle pretty much as stock. The Stage III has a little tiny bit of lope. The Stage III just feels stronger through all RPM bands. Jon Mortenson is right.......there is no reason not to go Stage III. The only mod you need is the shorter valve seals when you exceed .460 inch lift......plus the performance valve springs and retainers of course.
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    90 300zx and a 1996 Acura NSX.....but who's counting?

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    What was the HP gain going to the Stage III from the Stage II?
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    I have no idea......All 3 of my L28 motors are Stage III......the L24's are Stage II. The L28's run about 165 rear wheel h.p.
    Last edited by Diseazd; 07-22-2012 at 02:12 PM.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    A little more progress...........Eiji's bolt kit and Z Therapy quality work make for a nice looking motor.
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    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Wow!

    Intake heating tube and all!!!!

    You are the man Guy!
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

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    Would you mind sharing your coating method for the following....

    Exhaust manifold
    timing cover
    valve cover

    If you are painting yourself, could you share the name of the products?

    Also, did you paint the original crank pulley or is it rebuilt / new?

    Looks fantastic. Can't wait to hear how you like this sort of unique combination of engine parts.

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    Jonathan.....I bead blast each item......I acid etch prime the front cover and valve cover.....I then spray with VHT aluminum paint. All painted parts such as the pulley, alternator bracket, motor mounts etc. Are bead blasted, acid etch primered, then painted with Datsun Blue spray paint from Classic Datsun or other correct colors. I use new thermostat housing, cover etc. The best part is installing all these like new parts with new hardware from Datsun Spirit. It makes for a nice looking finished product.
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    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Thanks Guy. Do you find that the VHT paint holds up well on the exh manifold?

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    If you bead blast it to metal.....then apply. Not nearly as good as ceramic coating, but that's $150.00.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Update.......Installed the L28/L24 combo motor in the new 72 Z. I put 350 miles on her and didn't really push her till I put the new 2 1/2 inch MSA Premium exhaust system on. WOW.......What a wonderful motor.....she pulls so quickly, smoothly and torquey to 7,000 rpm that you need to be ready to shift (it sneaks up on you so fast). This engine is so much better than I thought it would be. It's just is so silky smooth up the rpm band and down the rpm band (downshifts). The L28 motors (with L28 cranks) are pretty much done at 6500. Not this motor.....It is a joy to drive and as OZ mentioned, it must have the perfect bore to stroke ratio, cause it's truly amazing! I would recommend it to any Zed Head!
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    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Very nice Guy!
    Jeff
    Northville, Michigan
    IZCC #1285
    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
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    Thanks Jeff......I'll post dyno numbers soon. Hope you and the family are doing well.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    She's a beauty!
    Life's a journey; enjoy the ride!

    Mitchell
    L28 - N42 Block w/Flat tops - N42 Rebello Head & Cam - Triple 40 PHH Mikuni's - Headers - Recaro Seats -
    R180 3.9 Diff - Close Ratio 5 Speed - Toyota Vented Brake Upgrade w/ Porterfield High Performance Pads & Shoes

    1972 Datsun 240z
    HLS30-75040


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    Nice stuff Guy! Way to break new ground on a 40 year old car!
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


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    http://ZSportCanada.com


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    So Guy, what color Z are you going to do next? (ducks and hides)
    Jeff
    Northville, Michigan
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    Extremely funny Jeff......believe me......this is it. It's getting hard to keep them all driven, oil changes, tune ups, washing ,R/T mounts etc. etc. They're like your kids.....you wouldn't trade any of them, but if you had to raise another one, you'd shoot yourself. Yellow is a nice color.
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    Awesome! Can't wait for the numbers.

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    Hee hee... I have no idea how you do it now Guy.
    Jeff
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    I just wish all the motor heads on the forum lived closer together......L series motors are what I love to mess with. Would love to be closer to all you guys. Eiji and PJOE are the only real motor guys around here and Eiji lives 2 hours away. Now that guy really builds a beautiful motor and he really appreciates the L series Datsun engine.
    Last edited by Diseazd; 10-22-2012 at 06:28 PM.
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    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Story of my life Guy. Being in Michigan with a Z car is a lonely place to be. There are three Z racers I talk to regularly online about engine and chassis setups. One is in Georgia, one in Texas, and one in Washington state. I'd love to be able to get all of our cars together on a track so we can really see what does and doesn't work, but we're just too far apart.
    Jeff
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    I would love to come and play in your sandpit boys but there's a big pond in the way!! Damn.

    Great news about the engine, I just knew you were going to love it. Looks fantastic in there, nice pics.

    All the best to you Guy, Regards.
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Two Kangaroo steaks for you OZ for giving me the idea! Hope things are going good over there. Regards......Guy
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    Let me know next time you're coming 'down under' and I will chuck some 'roo steaks on the barbie for ya!!

    I drove my car on Sunday with a group of other Datsun nuts through some great back roads in the country. Gave me a chance to open it up a 'little', and the bark/howl the engine makes is superb. I'm sure it's to do with the rod to stroke ratio, it just transforms the way the L28's perform.

    Enjoy your new engine mate. I'm so happy for you!!

    Cheers.
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

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    I liked the new engine so much, I'm going to do it again. I just bought this F54 block......I'll put an L24 crank and rods in the L28 block.....again,I'll use the shaved and shimmed P79 head built by Z Doc in Roanoke, Virginia along with .040 over flat top L28 pistons (ITM).


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    Dyno numbers?
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Sorry Steve...none yet......My friend is moving his dyno to his new warehouse.....I've been bugging him, but It'll have to wait.....the car is at the restoration shop now anyway......my guess is not as much as the longer stroke motor, but who knows. The bore to stroke ratio is nicer on this motor, and it's more fun to drive.
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    Quote Originally Posted by Diseazd View Post
    I liked the new engine so much, I'm going to do it again. I just bought this F54 block......I'll put an L24 crank and rods in the L28 block.....again,I'll use the shaved and shimmed P79 head built by Z Doc in Roanoke, Virginia along with .040 over flat top L28 pistons (ITM).


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    Excellent!!
    '78 280C sedan P30 Y70 L4N71B 4.11 H190 N/A A 'NEW" engine combination 131 rwhp.
    '71 240C coupe N42 NEW E88 FS5W71B 4.33 H190 Megasquirt V3.57 212 rwhp

    'Nissantiques - join the club'

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    Interesting build Guy. Does it rev better than an L28?

    I'm currently building a F54/P79 combo with a milled head to bump the CR.
    Jeff
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    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
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    '74 260Z BRE look-alike crap can for Optima Batteries ChumpCar World Series Racing racing
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    Quote Originally Posted by Jeff G 78 View Post
    Does it rev better than an L28?
    The thing here is that "revving better" is hard to quantify...
    2/74 260Z

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    Hi Jeff....Yes it revs better than a standard stroke (long stroke) L28.....it drives so smooth and doesn't fight getting to 7000 rpm. I imagine this is what a Ferrari feels like with their short stroke motors. Remember to shim the towers .080 inches and shim up the springs .080 also. You do that with 2 extra spring seats which are .040 inches each.
    Hi Oz.....You were absolutely right.....it's the perfect bore to stroke ratio. Leave it to me to question Nissan....in 1975, they lengthened the stroke for more CID.....however, for driveabilty, I find this motor "just what the doctor ordered" BTW, does anyone with an L28 car know what your redline is on the tach for the stock L28? I broke one at 7500 last week....spun a bearing.
    Last edited by Diseazd; 06-03-2013 at 10:42 AM.
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    Guy, I'm milling 0.050" from the head and I'm going with no shims. I will drill the cam and use the SBC offset bushings to set timing and I'll adjust the guides to get the tension right. I am told this procedure works fine. I hope so...

    http://www.summitracing.com/parts/cca-4760
    Jeff
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    That's right, you told me that before.......you'll love that set up Jeff....lots of low end torque! Good luck.....post pics of the mods.
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    I'll be looking forward to a thread about the new engine. My mechanic has F1 experience and likes fast-reving engines, he suggested something like this. Of course it will have to wait til I have a big project to work on, no money now. It's a little over my head but I won't be doing any real work - no place to do it.
    Also I'm running a Y70 on my 240 - so Oz's build thread was also a big help. I'll start a thread asking about cams etc (got stock C211 cam, nice flat torque line but quits about 5000 rpm, dunno what others are using) for the Y70 after I think about it some more.

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    I was playing with the engine calculator and it looked like the chamber size had to be pretty small to get the CR up. What size chambers are you running.

    I looked at 40cc chambers and it put me over 10CR. Now a lightened flywheel, triples and a large cam might really make a rev machine.
    Congrats on making this work. There's a lot of emphasis on bigger is better, but sometimes it's not about that at all.
    Steve
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    I just re read the thread -9.2 to 1
    Personally I would have done 10.2 to 1 with that cam, but again thanks for sharing. I just received a L28 bare block and it makes me think about it!
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Supporting Member Diseazd's Avatar
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    I just received my new .040 over ITM pistons......they're beautiful.....look like factory Nissan. If you need replacement pistons for your Z's or 510's, use these pistons. Let's keep a good supplier of pistons for our cars.
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    If I went this route I would step up to forged -rev rev
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Guy,
    Where did you buy your ITM pistons?

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    The Nissan dealership in Roanoke. You can usually find the ITM ad on eBay though.
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    Quote Originally Posted by jonathanrussell View Post
    Guy,
    Where did you buy your ITM pistons?
    I put flat top ITM pistons in my street L28 and I got them from Black Dragon. I think they were $240 for the set with rings. They carried std and oversize at the time. I assume they still do.
    Jeff
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    Supporting Member Diseazd's Avatar
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    Spruell Racing in Atlanta can probably get 'em also Jonathan.....they're in Atlanta......great folks to work with ......I buy my Panasports there....$150.00 cheaper than anywhere else. The ITM's are nice....aren't they Jeff?
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    My ITM pistons were great, but I should have thrown the rings away. I'm guessing it was a Black Dragon cheapness rather than an ITM problem, but the rings weren't individually packaged by piston like every other ring set I have ever bought. They were literally all together in one bag with no instructions as to groove positions or top/bottom orientation. They also didn't match any bevel/notch design I have ever seen, so it was anything but obvious. I took my best guess at it and threw them in. I'm convinced better rings would have increased my performance. At the time, I was in a hurry and I didn't have time to order a new ring set. That was about 10 years ago.

    I have not heard of any such problems lately with the Black Dragon piston/ring sets, so I think they got their act together.
    Jeff
    Northville, Michigan
    IZCC #1285
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    "My ITM pistons were great, but I should have thrown the rings away." Quote

    I'm using the Nissan rings with my set.......they're still available.
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    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Guy, did your ITM's come with rings?
    Jeff
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    IZCC #1285
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    http://www.classiczcars.com/photopos...00&ppuser=7975
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    Yes, but I haven't got them yet....they're coming in a separate box. I'll let you know what they look like when I get them. I just like Perfect Circle, Total Seal or Nissan rings. The oil rings and spreaders are excellent on all 3.
    Last edited by Diseazd; 06-04-2013 at 09:13 AM.
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    90 300zx and a 1996 Acura NSX.....but who's counting?

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    I'm on a tighter budget than you, so I went with Sealed Power for my current build. The three you listed are double the price.
    Jeff
    Northville, Michigan
    IZCC #1285
    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
    http://www.classiczcars.com/photopos...00&ppuser=7975
    '74 260Z BRE look-alike crap can for Optima Batteries ChumpCar World Series Racing racing
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