440 with 452 heads and high compression?

[Dguyski]

Hey guys, I've heard a thing or two about how you shouldn't go high compression with open chamber heads, yet i also see guys having done just that. It just so happens that my 440 has 452 heads with 2.14"/1.81" valves, pocket porting and blended bowls, along with gasket matched intake runners and a gasket matched tunnel ram. That woke her up immensely, but I'm still running on factory turd pistons with 1.91 compression height and 90cc combustion chambers, coming out to like 7.8:1 compression. I found a set of ICON forged pistons, 2.067" compression height and 5.6cc domes, which should bring it to 0.015" deck clearance for 10.27:1 compression, according to the calculator I'm using. Is this high of compression too high for open chambers, and if so, why? If I had the heads and intake milled to raise the compression further, couldn't i just run race gas, like 100 octane? Or would the lack of quench cause further issues with combustion?

 

[RustyRatRod]

Just use race gas. Problem solved.

 

[Dguyski]

Ok, no biggy. Is the lack of quench what makes open chambers poor for high compression? I've had a tough time finding a very detailed expansion of that

 

[Fisher]

I am running a 10.0-1 compression big block on the street with a .243/.251 duration can @.050 on 92 octane with 32 total timing in by 3000 rpm. no detonation at all.

 

[RustyRatRod]

Ok, no biggy. Is the lack of quench what makes open chambers poor for high compression? I've had a tough time finding a very detailed expansion of that

I think people make too big a deal about quench this and quench that. Remember this: There is only about a 3% difference in power output give or take from one compression ratio to another. Were I you, I would build in the 9.5 area and have fun.