Chevy Small Block Short Water Pump Double-Groove Aluminum Crankshaft Pulley - Black Ford it was a no-brainer

it was a no-brainer

and rotor style before installation

and bolt pattern before ordering

Blade Quantity: 8

Overall Width: 31

Chevy Small Block Short Water Pump Double-Groove Aluminum Crankshaft Pulley - Black Ford it was a no-brainerCrankshaft Pulley Fit & Belt Alignment: This pulley is built for Chevy small block accessory drive systems, with the key dimensions needed to match belt routing, accessory position, and pulley spacing. Spec Driven Compatibility: V Belt, 2 groove, 6. 600" outside diameter help determine correct fitment for the accessory drive system. It is configured for Short setups. Match groove count, belt style, bore size, and pulley offset before installation.