I want to switch to aluminum heads and raise my CR to 9.2 - 9.5. I am running road race tracks and am using an oval port Air Gap with a Comp cam 280 and a 750 Holley. RPM range is 3000 - 5500.

My main goal is to get rid of the weight of the CI heads. While I am at it I thought going up in CR would be worthwhile.

Edelbrock says that I can use a 60459 (110cc) head and get 9.5 with domed top pistons or 60499 (100cc) with flat top pistons and get 9.2. Obviously a lower cost route.

Any thoughts?

Jim