What about the head choice Pat. To big or just right. Comp will be 8.4. I still don't know about rollers for the street. I want as low maintenance as possible. Don't want to change lifters every 10k. And i admit i know little of hyd rollers. I have had good luck with flat tappet solids in the past. What also puzzles me is how a heads runner size and flow can alter torque and hp levels. Smaller ports will give better torque, but less hp? Whats that about. And how do you apply this to a blown motor.