comp xe-r #446 install q's
 

guys i know it's been asked a million times, but if i simply install the aforementioned cam in my stock motor with pushrods, valvesprings and retainers do i need to pull heads and check ptv clearance? i know the obvious answer, but i'm feeling lazy, and if i'm going to take the heads off i'd rather replace them with a cnc ported variety. ideas? my goal is to keep the heads on the motor.