GT40P heads and 1.7 rockers ?

[tmoss]

Tthe benefit of 1.7 rockers is more in the faster opening rate and slighty longer VALVE duration (as oppesed to cam duration which does not change) for P heads. I ran 1.6s at first and swtiched to 1.7s later - it's worth some power. Have not been back to the dyno to prove how much yet. Ask any truely knowledgable racer about exceeding the peak flow point in lift, and he will tell you it's often beneficial. The P head flow rate levels off more at .500" than falls - it only loosed a couple of cfm. Get that valve open faster and longer, power will follow.