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Thread: ZZ502 Engine

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  1. #1
    Eeshee is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2012
    Car Year, Make, Model: 1969 Chevrolet Chevelle-Malibu

    ZZ502 Engine


    Umm. So I'm new here... and new to this whole car thing in general. So bare with me.
    I've got a ZZ502 motor bored 30 thousandths over to a 509. I want to replace the pistons in it to achieve a lower compression ratio, specifically a CR of 9:1. The CR right now is 13:1.

    bore: 4.500"
    stroke: 4.000"
    rod: 6.135"
    piston to deck: 0.015"
    piston dome volume: -13.6 c.c.
    combustion chamber: 62.0 c.c.
    head gasket thickness: 0.039"

    so uhh... where should I look to buy new pistons? What company should I go with? What should I vary (i.e. piston dome volume, head gasket thickness, compression height, etc.)?

  2. #2
    pat mccarthy's Avatar
    pat mccarthy is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Apr 2005
    bay city

    flat top will get 9.3 with a 119 cc head chamber flat top piston 3cc. were are you getting 62.0 cc for a big block head chamber ? head gasket felpro F1047 is .039 and 10.5 cc
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip

  3. #3
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2006

    yep---some wrong numbers on head CCs-------------

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