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head milling

This is a discussion on head milling within the Internal Engine forums, part of the LSx Technical Help Section category; I'm looking for some pointers guys. I have 241 head castings on my 04 GTO. I've already ported them and ...

  1. #1
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    head milling

    I'm looking for some pointers guys.
    I have 241 head castings on my 04 GTO. I've already ported them and looking to mill them now.
    right now I'm running a 220/224 .580/.590 112lsa cam and looking to upgrade to something around a 236/242 .580/.590 112lsa.
    no matter what exact cam I get I want to stay at or below .600 lift since this is my DD and I don't want to be beating the hell out of my valve springs.
    so my question is how much can I take off the heads to bump my compression up......can I go all the way down to 59cc and still run pump gas?
    I know there is a difference between dynamic and static compression and I think I was told 8.75:1 max dynamic compression on pump gas, but not certain, and I don't know how to figure dynamic compression from static compression.
    also I don't want to have to flycut my pistons for PTV clearence

  2. #2
    🤔 11s. blackbirdbrain89's Avatar
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    black trans am
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    ls1 tech has a calculator for DCR and SCR worth playing with and seeing what u can do... u can run 12 SCR and still run pump gas so i think ull be ok

  3. #3
    cutting and welding mark21742's Avatar
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    hugger orange
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    Quote Originally Posted by blackbirdbrain89 View Post
    ls1 tech has a calculator for DCR and SCR worth playing with and seeing what u can do... u can run 12 SCR and still run pump gas so i think ull be ok
    the calculators I looked at needed the intake valve closing degree ABDC and I have no clue what mine is to throw the numbers in.
    hey if your still up give me a call

  4. #4
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    SOM
    1998 T.A.

    That cam will not clear if you mill it ANY at all. You will have to run a stock thickness (.054 compressed) head gasket too.

  5. #5
    cutting and welding mark21742's Avatar
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    hugger orange
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    Quote Originally Posted by SOMbitch View Post
    That cam will not clear if you mill it ANY at all. You will have to run a stock thickness (.054 compressed) head gasket too.
    the 236 cam won't clear milled heads?

  6. #6
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    SOM
    1998 T.A.

    It would clear a cleanup mill but that is about all........

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