I want the compression ratio somewhere between 10.5-11. Ive found a few combos that would work

54cc combustion chambers (stock 350 head) with a head gasket .080in =11.08 to 1 ratio

62cc combustion chamber heads with .039in head gasket = 11.17 to 1 ratio

64cc combustion chamber heads with .039in head gasket = 10.86 to 1 ratio


Which one do you guys think would be better for a STREET ONLY car, or do you have other thoughts and combinations. I dont plan on driving it everyday but would still want to be able to, this car wont see any track time

Any input helps

 

Just put premium in it and forget it. You will be good to go.

 

Compression ratio is also determined by things like deck height, cylinder bore and piston valve reliefs/dish. Did you include them in your calculations? Since you're considering such a thick head gasket that leaves me to believe that you didn't. .080" is THICK and will result in a super wide quench - NOT good for power. Stock is .049". Most people go with a .028" gasket.

Also, for a street motor I would target something along the lines of 11.5:1 compression. Anything less and you're giving up free potential HP. There is no drawback in doing so.

 

I am going to assume this is a joke.

 

would 11.5 be too high to run 93 though, by what ive gathered 11.5 is pushing it

 

I also planned on using flat top pistons with 2 valve reliefs, =7.00cc. And i did factor in the cylinder bore which would be 4.030in. Deck i did not do

 

+7.00cc, my mistake

 

There is .31 c/r difference between the lowest and the highest configuration. Plus, small things like cleanup passes will change that. Whats the difference going to make? Differences in dyno hp? Back to back dyno runs have more error than the hp increase in .31 c/r.
Really. What's he going to use? Race gas?
I dunno, maybe I missed the point he was tring to make/ask.