comp XE HL 275 camshaft

dodge, it's the exh valve opening too early, truthfully. It's opening when there is still a bunch of pressure in the cylinder. I have yet to run Lunati, because I dont particularly love the lobe designs for street cars. I will say, fewer than 5% of cam failures can be attributed to the cam or lifter themselves. It's ALWAYS something to do with installation, oiling, or first-starting procedures. I have seen lifer with no crown, and I have seen flat tappets with no taper... but the usual culprite is assembly/starting errors.