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Thread: Compression Help

  1. #1
    Senior Member MASTER BUILDER
    Join Date
    Oct 2006
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    West by God Virginia
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    160

    Compression Help

    I have a 415 SBC race engine that was built for circle track. It has had the block zero decked and has Flat top pistons. It curently has vortech heads that have been milled. The compression is right at 12.5 with this combo. I want to run this motor on the street. I have a set of dart 64 cc heads. With these heads will the compression drop enuff to run 93 otc. pump gas without hurting the motor?
    In God We Trust!! All others pay cash!!!!

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
    Posts
    2,890
    If i did the caculation right, you currently have a 4.125 X 3.875 with 58CC heads, which equals 12.53 compresion useing a .041 head gasket. If you go too 64CC heads and a .062 head gasket, you can end up with 11.08, which will get you close to pump gas specs.

    JMO

    Zip.

  3. #3
    Senior Member MASTER BUILDER
    Join Date
    Oct 2006
    Location
    West by God Virginia
    Posts
    160
    Thanks for the info Zip.
    In God We Trust!! All others pay cash!!!!


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