Allstar Water Pump Pulley, V-Belt, 2-Groove, 6.625" Diameter, Aluminum, Small Block Chevy / Short Water Pump (3/4" Shaft)

Specifically for short or Corvette water pumps, pulleys work with power steering pump and pulley to provide a ratio within the GM specified RPM range. Race engine RPM differs greatly from street engines. For 30% less water pump speed and reduced weight and inertia, the crankshaft and water pump pulleys are smaller in diameter than standard reduction pulleys. Acceleration capabilities are greatly enhanced.