I picked up a set of J heads. I'm going from 1.88 to 2.02 They have good thick wall 3/8" bronze guides and polished chambers. I'm having hardened seats installed, Vinton seals. I'm using Hughes stainless 2.02 and 1.6 valves. Std length. Both single groove locks. I wanted to be sure there was no issue with the pushrod that can't be addressed before having the seats installed. They are cleaned and checked for cracks and all is good.