what's the highest compression you can run pump gas(93 octane) with? what's the best way of goin bout gettin more compression milled heads and flat top pistons, or unmilled heads and domed pistons or any other ideas?

thanks

 

well the highest i heard an ls1 running is 14-1 but i don't know what octane. i guess the only way to get there is milled heads, or one hell of a domed piston.

 

http://cochise.uia.net/pkelley2/DynamicCR.html

 

oh, and i used 6.6 domes, 5.7's milled .020, and 045 gasket for 12.02

 

looked up diamonds catalog and with 62cc ls6 heads and there off the shelf dome piston it's 12.2:1 ... anyone know what it'll be with 5.3 heads? ... and is 12.2 pump gas friendly

lookin for the absolute most compression possible and still be on pump gas ... someone's got to have tried this before

 

If you run a coating on the chamber you can run more compression. I run 11.5 to one i think. I could add a full point i think because of the coating i run.I use sunnoco 94 though.

 

that's what i was thinkin 11.5 ... jrp, you gonna be runnin pump gas with 12.02? i'd like to see the results of that if you are

 

I'm:
.010 out of the hole
.045 Gasket
61cc chamber AFR's

At approx 11.3 : 1 I should be safe and happy on 93 Octane per Tony

 

I ran 11.5:1 on 94. Just make sure you keep the engine temp down... 160* thermostat recommended.

 

so how would you guys go bout gettin 11.5:1 ... use dome pistons and unmilled heads or flat-tops and mill ... which is better and why?