Discussion Starter · #1 ·
i have a 351w with stock heads. i bought comp cams long slot rockers, longer pushrods, and their adapter kit, so i could put a different cam in (.509 intake lift, .512 exhaust lift). after i assembled the motor, i have no clearance between the bottom of the rocker arm and spring retainers on the intake valves. the exhaust valves seem to have plenty of space. what can i do to gain clearance under the rocker arms.