Marginal oil or vacuum pressure at high RPM is one of the fastest ways to end a race weekend early.

Moroso 37800 Water Pump Block Off and Filler Neck Kit Features:

• Upper cylinder wall distortion is greatly reduced when these 3/4" NPT plugs are installed in the water passage holes in the decks of Small Block and 90 V6 Chevy engines.
• Water holes must be tapped before the plugs are screwed in block must also be decked after installation.
• Plugs also restrict water flow to the cylinder heads by reducing size of water passage holes to 5/16".
• Packaged six to a kit.
• Quantity: Sold as a Kit.