Hey! Correction on duration of hughes cam 252/256 @50. Sorry bout that, ive had so many cams i forget all the specs. The clearance was pretty close but it cleared. Of course 'i ran the cam with straight up with no advance nor retard. I cant remember the exact clearance but I remember having plenty of clearance on the int. side but it was close on the exh side. I want to say I had bout .020 to play with on int and only bout .008 on exh. to play with (not much). But so far i've had no issues and its gets reved to 6500 often. FYI its a hughes HTL5256 cam (one bolt)