I have a stock 02 bottom end LS1. I will be installing GMPP (65cc now) heads with stock gaskets and would like a CR of 11:1. What should the CC of the heads be? I figured 62cc by using a proportion, but the calculator is giving me a different figure.

I will also be installing a comp 222/224 .566/.568 on a 112.

1. What should the pushrod length be?
2. Any concerns with PV clearance with this set up?
3. Is 11:1 CR too high

 

If all you want to change is the chamber size to get to your goal 11:1, 62cc will get you 10.95:1... assuming you are .007 out of the hole and you are using the factory composite gasket.

 

Thanks, then to get to 62cc from the out of the box 65cc, how much will need to be taken off the heads?

 

approx. .018"-.020".

 

Thanks Gunnar

What would the pushrod length be with a cam that has a base circle of 1.49