Water Pump Block Off and Filler Neck Kit [Deck Plug Kit, Wall Distortion Reduced, Restrict Water Flow to Cylinder Heads]

Name: Water Pump Block Off and Filler Neck Kit [Deck Plug Kit, Wall Distortion Reduced, Restrict Water Flow to Cylinder Heads]
Brand: MOROSO
SKU: 710-37800
Price: 24.99 USD
Availability: InStock

^$24⁹⁹

Ships on Sep 22, 2026

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Water Pump Block Off and Filler Neck Kit

Deck Plug Kit

Wall Distortion Reduced

Restrict Water Flow to Cylinder Heads

Sold as a Kit

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.

Part TypeWater Pump Block Off

BrandMOROSO

Package Height1.1

Package Width5.3

Package Length7.1

Weight0.6 PG

Part CategoryPerformance Parts

Deck Plug FinishBlack oxide

QuantitySold as a Kit

Part FitmentSemi Universal

Deck Plug Thread Size (In.)3/4 NPT

Deck Plug MaterialSteel