COMP Cams High Energy Nitride Steel OEM / Long Slot Rocker Arm - 3/8 in Stud Mount - 1.50 Ratio - Small Block Chevy (Set of 16) H763CB3S there are four separate stages

there are four separate stages that can be activated independently yet add up together

bolts and pick-up (uses stock oil pickup) not included

Extremely Durable Lightweight Aluminum Construction w/Black Finish

Output Protection: User definable over current limits

855 in Bore

COMP Cams High Energy Nitride Steel OEM / Long Slot Rocker Arm - 3/8 in Stud Mount - 1.50 Ratio - Small Block Chevy (Set of 16) H763CB3S there are four separate stagesThese nitrided COMP Cams High Energy Steel Stud Mount Rocker Arms designed for Chevy V8 265 400 applications feature a 3 8" stud diameter and 1. 5 ratio. High Energy Rockers help eliminate the noise and slop associated with older worn and high mileage stock rocker arms. With a long slot for higher than stock lift camshafts, these rocker arms are an excellent replacement choice for engine rebuilds using either stock or High Energy Camshafts. Product