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. Procomp Electronics Aluminum Heads, Comp Cam, and RPM Every step of the. I don't necessarily trust that engine calculator. COMP Cams Dyno Results for XE274H Chevrolet 350 Small Block Camshaft. 350 cid Small Block Chevy Package AFR 180cc Street Heads 9 to 1 Compression 1. Flat tops with four valve reliefs are usually around -5cc's. 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. The firing order is the same for the Chevy 350 as well as many other small block and big block Chevrolet V8 engines. That means next to the number one spark plug wire will be the number 8 spark plug wire, the number 4 and so on in a clockwise rotation. 350 sbc new rebuilt with std flat top pistons, 64cc aluminum heads 2.02 x 1.60 valves, 7/16 screw in studs, valve guides, 1.5 aluminum roller rocker rocker arms, 5. 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. The Chevy 350 firing order is 1-8-4-3-6-5-7-2. Gasket thickness (including deck height)=.

I used a calculator I found online with a google search, and typed in numbers until I got a 350 with 8.5:1 compression.

Comp cam 350 sbc