This Aluminum Triple Groove Crank Pulley for Ford Small Block 289, 302, 351W with 3 Bolt Damper and Standard Rotation Water Pump with Passenger Side Lower Radiator Hose. Designed to Replace Factory V-belt or Steel Serpentine Pulleys. Best used on Ford Small Block 289, 302 and 351 Windsor Standard Rotation Water Pump with Passenger Side Lower Radiator Hose 3 Bolt Balancer Water Pump Flange to Damper Face Measurement of 3-7/8".