Which pistons, and .477/.480 lift? What rockers are you running right now? Use a piston stop to verify and put number one to TDC, remove the rockers and valve springs, install checking springs on number one, and measure the lift amount where your valves meet the pistons. Comp can take those measurements and tell you how much rocker ratio will work. Most shelf pistons with generous valve reliefs won't have any trouble with .509/.512 lift with only .012 out of the hole. But I doubt you'd even notice any difference between a set of 1.5 and 1.6 rockers. If I had the gear and converter, I'd do the measurements and see if I could switch up to a comp XE solid cam. IF you can find one anywhere, though. You might would have to go with Ken at Oregon Cam Grinders to get one in a reasonable time frame. I guess I should ask, is it together and running yet or are you still in the assembly stage?
