on stack motor how many of you guys have ran into piston to vaulve clearance probs. what cam? and in particular MTI's Y1 (234/240 .598/.608 113).

 

Most cams up to and including the T-rex (which has larger specs) will clear the stock heads, unless of course stated otherwise. Its usually once you install larger valves or start milling the heads that you run into p to v clearance.