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Thread: Are 240z -280z heads and cam and valves interchangeable

  1. #1
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    Default Are 240z -280z heads and cam and valves interchangeable

    I have an older 240z engine built up mildly (Cam and valves) but after pulling the head off i can see a few cylinder walls are trash. It has an 83mm bore which from my understanding is stock 2.4l and the options I am seeing is bore it to clean it up and then gain some hp but I would have to but oversized pistons, or if it is possible put the heads on my l28 280z engine and do a rebuilt on it and bore it out a little and do some modifications. I only recently got into the Datsun world so I dont know a whole lot but if you guys have any better ideas I would love to hear them. I am 17 and my 280z is my senior year project.

  2. #2
    Registered User madkaw's Avatar
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    I would do what is the most cost effective. Have you looked at the cylinders on the 280 motor yet? These bottom ends are pretty bullet proof and most of the time it's just the head that needs the real work.
    Yes that head will work on that l28 block.
    You need to do some research ! Considering this is a school project I would think that would be part of your homework
    Things to consider
    CR - small chamber head on bigger bore= high CR
    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

  3. #3
    Registered User EuroDat's Avatar
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    Download the FSM's for both engines and do some reading in the engine chapters. Any of the 280Z and the 240Z manuals will get going it the right direction. See link for manuals
    XenonS30

    This site will give you an idea of what is possible too
    Datsun L-series ZCAR engine modifications

    Chas
    Chas
    5/77 280Z HLS30 403100 with some modifications
    Original colour: 305 Light Blue. The PO changed it to Red

  4. #4
    Registered User EuroDat's Avatar
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    Double post. Lost my connection for a minute......
    Last edited by EuroDat; 07-18-2013 at 01:49 AM. Reason: Double post
    Chas
    5/77 280Z HLS30 403100 with some modifications
    Original colour: 305 Light Blue. The PO changed it to Red

  5. #5
    Registered User 71Nissan240Z's Avatar
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    Download a book called "how to modify your Nissan/Datsun oho engine" it is a must for frankenstien engines concoctions.

  6. #6
    Registered User 71Nissan240Z's Avatar
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    Ohc engine*

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