: This auction is for one(1) Blower Pulley Vee-Groove Small Block Chevy Adapter. It is made with 6061 T-6 Aluminum, is .700" wide, 6.25" in diameter, and has both a standard 6 hole bolt pattern and 3 hole harmonic balancer bolt pattern. It uses the standard 2 inch register, and has a 1/2 inch crank bolt hole. Any questions call 626-815-8815. Terms of auction: U.S. SHIPPING ONLY!