Compression Ratio question

Discussion in 'Engine Topic' started by AF1Strider, Apr 14, 2012.

  1. AF1Strider

    AF1Strider New Member

    24
    0
    Jul 24, 2011
    Albuquerque, NM
    Hello, I have a 350 in my '74 Z28, it has 64cc heads, and I can only assume it has flat top pistons. I was wondering if anyone could help me out on ball park of a compression ratio it might be pulling. The head casting numbers are 14096217 and the block is 10243880. Thanks for any help.
     
  2. 1981zapper

    1981zapper Veteran Member

    Approximately 10:1, would need more info to give an exact compression ratio, such as if block has been zero decked, heads shaved, gasket thickness, more info on pistons
     
  3. BondoSpecial

    BondoSpecial Veteran Member Lifetime Gold Member

    8,699
    0
    Sep 20, 2004
    Southern Maryland
    without knowing pistons we don't know anything. I have built very similar engines, some having dish tops and some having flat tops depending on how much money was spent on them and what octane was desired. You wouldn't know without checking though.
     
  4. AF1Strider

    AF1Strider New Member

    24
    0
    Jul 24, 2011
    Albuquerque, NM
    I'm don't know anymore about the motor. I bought the car in August and the people I bought it from didn't know much about or what they were doing with it. I haven't torn it down yet, was just wondering about the compression ratio. Thanks for some info on it.
     
  5. hhott71

    hhott71 Veteran Member Lifetime Gold Member

    14,373
    0
    Mar 30, 2001
    Joplin Mo. 64801
    10 to 10.25:1 compression
    It works best with the 0.015" shim gaskets with the std 0.025" deck height.
     

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