What brand cast cam was it, anyone had a Hamilton break?
Maybe my heads in a fog right now , but can someone tell me what running a 13mm pump has anything to do with snapping cams? I can understand if your talking about spinning high rpms (4500+) for sled pulling, but drag racing and getting up to 4K rpms during shifts at max, I can't see how it would have any affect on breaking a cam?
Are you winding the truck in your sig that high between shifts.
I am the OP.. My 1-2 ahift is around 5,500rpm and after that it's around 4,900rpm. I am tearing this motor down to go bigger with a billet cam (230/240) and try to keep alive. For anyone curious my setup worked great with a cast cam/13mm p&b pump and I ran the billet scheid cover with the bearing for the nose of the cam.
Are you running better tires yet ?