![]() The first one I tried told me that a flat top 350 with 64cc heads had like 12.4:1, which I know is wrong. I don't necessarily trust that engine calculator. ![]() 510 Lift, I heard the stock springs for the 350 can take like. Flat tops with four valve reliefs are usually around -5cc's. 1 7 79Bird New Member 10 East Tennesse So Ive been building this 1974 Chevy 350 and I recently picked up a new cam from the Hot Rod Barn, and its a little too big for the stock valve springs. Usually the low compression engines have dished pistons that would yeild lower compression. *notes: I've never heard of -7cc pistons. If you were to go with Vortec heads, either get the ones that have been upgraded to allow for additional lift, or be very careful not to exceed the max for those heads. With the iron Vortec heads' chamber design, you may be able to, as well. Then I changed the combustion chamber cc's to 64 to see what a head swap would do to your compression, It was 9.6:1.ĩ.6:1 Aluminum heads, you will still be able to run 87 octane. Gasket thickness (including deck height)=.
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