Moroso first pioneered the aluminum water pump for racing over 15 years ago. Over the years, continual improvements have resulted in providing the best cooling system components available for competition use. Computer designed housing cast from 356-T6 aluminum and lightweight impellers are engineered to maintain consistent coolant temperature throughout the water jacket, preventing localized boiling, detonation, head warping and cracking, etc. Large diameter shaft and extra housing reinforcements for Oval Track applications Includes integral cam stop boss Overall length of 5. 795" from rear mounting face to hub face Note: Spacer Kit #MOR63510 converts the #MOR63500 pump to the '69-later "long" design.Pit Stop USA offers Moroso SB Chevy Aluminum Oval Track Water Pump - SB and 90° V6 Chevy 3/4" Shaft - 1971-82 Corvette Design 63505 at low everyday prices. Be sure to check out all of our products from Moroso Performance Products including Moroso Performance Products Small Block Chevy Water Pumps.