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Pair up a new set of pulleys sure to match for your Small Block Chevy equipped with a short-style water pump. These convienent combos feature cast aluminum construction, for use on 1955-1968 SBC engines. Precision machined cast aluminum construction Lightweight and strong For '55-'68 Small Block Chevy short style water pumps Double groove water pump pulley for two V-belts Triple groove crank pulley for three V-belts Kit Includes: (1) SBC Aluminum Short Water Pump Pulley - Double Groove (1) SBC Aluminum Short Pump Crank Pulley - Triple Groove ( SBC Aluminum Short Water Pump Pulley - Double Groove Fits over a 5/8 water pump shaft (can be drilled to 3/4 if needed) .30 thick at the hub mounting flange Diameter is 6-5/8 Outside Length: 3 Mounted Length: 2.71 Shaft Diameter: .63 Bolt Hole Pattern: 4 on 1.75 Belt Width: .38 SBC Aluminum Short Pump Crank Pulley - Triple Groove Diameter is 6-3/8 Mounted Length: 1.93 Bolt Hole Pattern: 3 on 2.75 Belt Width: .42 Inside Diameter: 1.10 Mounting surface to the center of the first pulley groove 0.34 Mounting surface to the center of the second groove 1 Mounting surface to the center of the third groove 1.59 Pulley width 1.94 Fit For 1955-1968 Small Block Chevy short style water pumps Double groove water pump pulley for two V-belts Triple groove crank pulley for three V-belts Made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading materials using up-to-date equipment, ensures everlasting reliability and enduring value It may be necessary to shim either or both of the pulleys to achieve perfect belt alignment. There are variances between manufacturers of both water pumps and pulleys. Water Pump Pulley: Mounted length is from the face of the water pump pulley mount towards the front of the engine. Crank Pulley: Mounted length is from the face of the harmonic balancer towards the front of the vehicle. Connects to various engine accessory drive components by a belt drive system and help ensure that components receive power from the rotating crankshaft to perform their vital functions. Kit includes Aluminum Upper Water Pump (Double Groove) & Crankshaft (Triple Groove) Pulley UPC 607615187821 ASIN B0H7VGZKNS Brand Name WINNEWFUTURE Manufacturer WINNEWFUTURE Model Number 486-SWP Material Type Aluminum Number of Items 1 Automotive Fit Type Vehicle Specific Fit Included Components Water Pump (2 Groove) & Crankshaft (3 Groove) Pulley Manufacturer Part Number 486-SWP Manufacturer Warranty Description 1 Year