Quote Originally Posted by Speed Freak
You can run any were between 9:1 to 12:1 on pump gas and it is streetable all of the ls1 to ls7 that came in the Camaros and GTO's, Corvettes have 11:1from the factory right now I am in the process of build a 12:1 motor and its streetable if it was me I would use the 10.5:1 CR pistons it will increase your power and it will have no problem being on the sreet well besides gas mileage... but its a sacrifice all of us street rodders pay right.
Your Gen II and Gen III motors also have reverse flow cooling systems which keep the combustion chambers nice and cool to prevent detonation. They also have fast burn combustion chambers which reduce the pockets of unburnt fuel and air in the far corners of the combustion chamber that cause detonation. You can't really compair the motors.


And muteboy, with carful parts selection, you can make over 400 hp on 9.3:1 compression. When I say careful, you have to be very careful not to overcam the motor. 9.3:1 is pretty low and won't support a lot of duration. When you buy your cam, try to select the one with the most lift for the duration you select. This will help to maximize cylinder pressure which is what you need to do to make power on a low compression motor. Your static compression ratio may be low, but careful selection can bring your dynamic compression ratio into the same arena as the higher compression motor.