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Thread: Before I call Isky please advise

  1. #1
    Registered User siteunseen's Avatar
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    Default Before I call Isky please advise

    I have a 9/'76 N47 cylinder head with a "B" internal oil cam with spray bar. I would like to know, before I call, if my thinking is correct. I want the Stage III grind on my cam using my rockers and lash pads as well as the cam towers to be installed on an E31 head. Is this the way to do it or am I wrong? Will I send them my rockers or should I get their's? lash pads?
    Thanks to anybody that can steer me the right way,
    Cliff
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    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

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    Supporting Member Diseazd's Avatar
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    Send your rockers to Delta Cams to be reconditioned like new......$4.00 each. Not sure where to buy lash pads, but you'll need to geometry the cam (center the wipe patterns). Isky sells .175 lash pads which should get you centered, but I find they can vary between .160 and .180's depending on the the head shop getting valve stem height even. Remember.....if you're using the E31 head with the Stage III Isky cam, you'll need the short valve seals mentioned earlier. Isky will take about 2 weeks to get the cam back to you. Finally, you will need to get a set of Isky valve springs to handle the .490 lift cam.
    Last edited by Diseazd; 07-15-2014 at 06:35 PM.
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    70, 71, 2 72's, and a 73 240z....
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    Registered User grannyknot's Avatar
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    Cliff, funny that you posted this just now as I was about to ask the same question.
    I'm looking at an Isky stage III for my N42 head.
    I have read many times from guys on this forum that they regretted buying a stage I or II after installing a stage III. I heard that the idle with a stage III is quite good and useable in a day to day situation.
    I'll be watching the replys.
    Chris
    1970 240Z HLS30 01955 March/70

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    Registered User 30 Ounce's Avatar
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    This is the exact cam that I use on my 3.0. The idle is slightly rough but not objectionable. I have an E-88 head with welded combustion chambers, large valves and ported by Bowers Racing. Bottom end is all Robello parts. My SU carbs were also modified by Robello. This is a very fun engine to drive on the street or track.
    74 260Z late
    3.0 liter Rebello kit
    Rebello mod. SU's

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    Supporting Member Diseazd's Avatar
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    Cliff.....Just a clarification. You didn't mean you were going to install the cam towers from the N47 onto the E31 did you? It sounded like that what you said in the first post. You definitely would want to use the cam towers from the E31 on the E31, not from the N47. Just checking. Guy
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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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    Registered User siteunseen's Avatar
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    Quote Originally Posted by Diseazd View Post
    Cliff.....Just a clarification. You didn't mean you were going to install the cam towers from the N47 onto the E31 did you? It sounded like that what you said in the first post. You definitely would want to use the cam towers from the E31 on the E31, not from the N47. Just checking. Guy
    Actually I was! Not now though, thanks. I hope the E31 towers have the oil passages for the cam as well as the spray bar. I'll look when I get home.

    Thanks again.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

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    Supporting Member Diseazd's Avatar
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    Yes they do have a spray bar.......In fact, you can send the cam from the E31 to be ground if you've got it. Just remember, it must be used with a spray bar.
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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?

  8. #8
    Registered User siteunseen's Avatar
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    That chart I posted in #1 says "Grind customers cam B". My internal oiler cam is a B stamped one, on the N47, it also has a spray bar. The E31 cam is stamped "A" without oil holes, just the spray bar. I would rather have both, oiler cam and spray bar with the automatic turbo's oil pump, flood the cam.
    Is there a L motor specialist at Isky that you deal with? I hate to keep bothering you with my questions and my local machinist is not very familiar with our cars. He said he could access all the details with a computer program he has. I thought about Eddie Radatz in Kennesaw, GA. I know Rebello is the most recommended but I'd like to keep it on the east side of the Mississippi. Who do you use?
    Thank you for all your insight, it's priceless...literally.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

  9. #9
    Supporting Member Diseazd's Avatar
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    A is 4 cylinder, B is 6 cylinder......they grind solid and hollow cams the same. I've never seen an N47 cam on a spray bar head. Does it have holes drilled in the lobes for internal oiling? It strange to me that they would have a spray bar and internally oiled cam, but have never worked on the early N47 head. Not sure who to recommend, but if you've never done one before, it might pay to ship it off. Z Doctor builds all of my heads, but he has slowed his ops to a minimum. I'm sure Dave Rebello will build you a nice head. My guess with cam, springs valves etc., you're looking at $2,000.00, but only a guess.
    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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