Head Gasket

[82chevy350]

Im running a 350 bored .030 over 9355)
i have 76 cc chamber heads i know im guessing anyway the heads are 920s
i wanna know what size compressed head gasket do i need to run to achieve my goal of at least a 9 to 1 ratio

[Ticker]

There's not really enough information there to make a recommendation. Generally on a 350 changing from an .048 to .015 gasket will give about a .6 increase in CR. You'll want one of the rubber-coated steel shim gaskets as the deck/head surface won't be smooth enough for a steel gasket.

There's no reason to chase CR unless you're doing a cam swap that needs it - a .5 increase in CR is worth maybe a 1-2% power bump on an otherwise stock or mild engine.

[82chevy350]

Well i do plan on runnung a .510 lift cam or a .460 was gonna put 305 heads on it but i would run out of top end just wanting some more torque

[Ticker]

Increasing CR won't measurably increase torque...and 305 heads are complete junk regardless of the CR increase they give with a smaller chamber.

The best way to increase torque, given the little detail here, is to swap the cam for an "RV" cam, put on good headers, ideally a tri-y design and look at a torque coverter swap.

[shortbed70]

No 305 heads,4x4 cam GEARS,GEARS. It will make a stock motor seam very strong off the line. Ask me how I know. 4.56 26" tall tire and th 350 trans.