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compression calculator

This is a discussion on compression calculator within the Internal Engine forums, part of the LSx Technical Help Section category; can heads be milled slightly and not have intake sealing problems? just different pushrod length?is .020 too much?...

  1. #1
    Member 383ls6's Avatar
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    red
    2002 z/28

    compression calculator

    can heads be milled slightly and not have intake sealing problems? just different pushrod length?is .020 too much?
    Last edited by 383ls6; 07-04-2010 at 07:00 AM.

  2. #2
    cutting and welding mark21742's Avatar
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    hugger orange
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    .020" mill will be fine...I milled .040" off of mine

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    Member 383ls6's Avatar
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    red
    2002 z/28

    actually the heads i'm looking at have.055 milled. seems like quite a bit

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    cutting and welding mark21742's Avatar
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    hugger orange
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    What heads are they? I've seen them milled over .060" before, but that is alot

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    I see flycutting in your future if you're getting a cam as well.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by ls1camino View Post
    I see flycutting in your future if you're getting a cam as well.
    x2 .

  7. #7
    Member 383ls6's Avatar
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    red
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    Quote Originally Posted by ls1camino View Post
    I see flycutting in your future if you're getting a cam as well.
    flycutting?

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    Member 383ls6's Avatar
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    Unhappy

    Quote Originally Posted by mark21742 View Post
    What heads are they? I've seen them milled over .060" before, but that is alot
    ok here is the problem. this is my first gen 3. On the advice of a friend when i ordered my block and rotating assy. I got -9cc dished pistons to stay around 11:1, 11.5:1. some compression calculators put me at 10:1 and some at 12:1. Before I shell out more cash I want to make sure of what I'm doing before i do it. The car is a DD. So this is what Ive got ....
    3.905 bore
    4.00 stroke
    -9cc pistons
    6.125" rods

  9. #9
    cutting and welding mark21742's Avatar
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    hugger orange
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    Do you know how many cc's the heads are now?

    60cc heads I get 11.06:1
    58cc I get 11.33

    Try wallaceracingcalculators

  10. #10
    Member 383ls6's Avatar
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    2002 z/28

    [QUOTE=mark21742;2380858]Do you know how many cc's the heads are now?

    60cc was planning on going with gmpp 88958622. wish i had done more research before ordering those -9cc

  11. #11
    King 0f n00bz shady milkman's Avatar
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    flycutting is taking some material off the top of the piston to increase PTV.

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