Are you tired of excessive black smoke, slow spool up, poor fuel economy, high EGT, and overall low performance???This stage 1 cam will cure all the above.With duration of 176 intake and .255 lift, 196 exhaust and .255 lift this cam will create what the 6.0-6.4 never had..... low end torque and top end performance.This camshaft in a H&S tuned and otherwise unmodified 6.4 produced an additional 67 horsepower at the wheels. That is power you can feel.On a 6.0 with a box SCT tune produced an extra 48 horsepower. With additional mods you can expect way greater gains in performance.I will honor a return on goods if you are not 100% satisfied with the performance. This camshaft is a brand new billet which means no marginal reground cams that are known to fail lifters because of hardness issues from the regrinding process.(improper or no heat treat after regrinding the base circle) Designed by Hamilton Cams. No core required.