I talked to him for an hour on the phone this morning, he's just about got me sold on his rockers and geometry kit. Basically the kit moves the rocker shaft slightly up and out to improve several things in the mopar valvetrain. The tech articles on his page explain a lot.Stainless steel 1.6 roller rockers, geometry kit, and rocker shafts are 600 a set. Small or big block. He custom adjusts each set according to your cam and some measurements you take off your heads and send to him. Pushrod holes in head need a slight opening up as pushrod angle is changed. He says they put a 360 on the dyno and loosened up 40 horse with no other changes than his rockers and geometry kit. Nice guy too.