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Old 01-31-2003, 06:58 PM
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Post Figuring Compression ratio with 66 cc heads

I am looking to get 10.0 to 1 compression in my small block chevy 350 im using 5.7 h beam rods 348 stroke 4130 forged crank and manly flat top pisons with 2 valve reliefs. The heads and intake i am using are from the holley systemax 2 kit 2.02\1.60 valves 66cc aluminum heads and street dominator intake, my big question is how to figure compression ration when using 66cc heads? what is the math involved, i want to know if these .030 over flat top manlys will give me about 10.0 to 1 compression, if the compression ratio is a little larger than 10.0 to 1 thats fine as long as its close

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Old 01-31-2003, 07:05 PM
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im sure there is a long drawn out math equasion that could give you the answer...but it might be easier to give holly a call tell em your set up..and 9 times out of 10 they can tell you the aprox comp ratio..in a matter of minutes
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Old 01-31-2003, 07:13 PM
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Pre-Stage has a calculator on their website. There are numerous other calculators on the web, look.
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Old 01-31-2003, 07:26 PM
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Without knowing the size of the valve reliefs, deck height, and head gasket thickness you won't know for sure. I put in .025 deck height (normal).015 head gasket thickness,(steel) and 4cc volume for the valve reliefs.(guestimation) With 66cc heads this comes out to 10.28:1. You'll know more when you install the pistons and can measure the deck height.
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Old 01-31-2003, 11:47 PM
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<a href="http://www.kb-silvolite.com" target="_blank">www.kb-silvolite.com</a> also has a compression calc. also a calc. to tell you what piston volume you'll need for what desired compression.
BBB I think prestage.com is run by a guy from my local track in Cicero NY.
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