This is what you are looking for if you want to add some chop and power to your GENIII/GENIV LS
LS 3-Bolt
Designed for Cathedral Port Heads
Cam Specs 21x/21x@.050 108 lobe separation and .553 lift with 1.7 rocker
We also offer Pac-1219 Drop in Springs for the Truck Camshafts for $220.00
