Speedway Motors Underdrive Pulley Combo for SBC 1969–1986 Long-Style Water Pumps With a 5/8" Shaft, Includes Double Groove Crank and Water Pump Pulleys with Matched Belts Kit

Combo includes cast aluminum double-groove aluminum water pump pulley, crank pulley, and matched pair of heavy duty belts. Slows water pump speed by 20% for increased horsepower. For Small Block Compatible with Chevy Compatible with V8s with '69-'86 long style water pumps with 5/8" shaft. Note: The lower crank pulleys in our combo kits are manufactured thicker than normal stock pulleys. This requires longer 3/8" bolts to be purchased separately. Allen head type bolts recommended. Get the correct pulleys for your application by learning which water pump you have as explained in our tech article. SBC - Short vs Long Water Pump.

• Complete Pulley Kit: Includes a double-groove water pump pulley, double-groove crank pulley, and a matched pair of heavy-duty drive belts
• Small Block Compatible with Chevy Fitment: Designed for Small Block Compatible with Chevy Compatible with V8 engines using 1969–1986 long-style water pumps with a 5/8" shaft
• Optimized Accessory Drive: Matched pulley sizing helps slow accessory speed for improved efficiency and consistent operation
• Durable Aluminum Construction: Cast aluminum pulleys provide strength, reduced rotating mass, and long-term reliability
• Installation Notes: Requires longer 3/8" mounting bolts (sold separately); Allen-head bolts are recommended for proper installation