Performance Gain Stock Rockers to 1.5RR?

[Billy Nees]

Originally Posted by SSDiv6

A higher horsepower/high RPM engine will benefit from aftermarket rocker arms due to reduced rocker arm deflection and stabilization of the valvetrain. Since the liberalization of camshaft specifications with more radical lobes and high pressure valve springs, a stamped rocker arm will have a very limited life.

And since we're on the subject, the"aftermarket rocker arms" that "reduced rocker arm deflection" and allowed the "stabilization of the valvetrain" ALSO made it a necessity to port your heads and intake if you wanted to stay competitive. In other words, in the good old days, you could either run well and keep your stuff together for a 7 round race or go fast and gamble on when you were gonna break a rocker.