got the specs on the cam, it is a sealed power camshaft. specs are GROSS LIFT OF 458/483, DURATION AT 50 IS 218/230 110 CENTERLINE.....this is all good, but it doesn't mean anything to me. How aggressive is this cam?? Looking for some increased power out of mine 289 and not too sure if this cam will help. The motor is bored 40 over with Keith black pistons and we are putting bigger chevy valves in and roller rockers and running a edlebrock intake and carb. Car is 4 speed with 411 grears. anyways, what do you guys think about the cam????