Chevy Big Block Double-Groove Steel Long Water Pump Pulley - Black Timing Cover they are precision-cut to provide

they are precision-cut to provide a secure fit to the block and motor mount

Hose Finish: Blue

This oval billet aluminum breather/accessory is built for compatible valve cover ventilation openings and crankcase ventilation systems

Chrome Steel Round Shielded Push-In Breather with Washable Filter for Crankcase Ventilation and Engine Dress-Up

Foam Sealing Ring: Included

Chevy Big Block Double-Groove Steel Long Water Pump Pulley - Black Timing Cover they are precision-cut to provideWater Pump Pulley Fit & Belt Alignment: This pulley is built for Chevy big 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 Long setups. Match groove count, belt style, bore size, and pulley offset before installation.