Holley Heater Block-Off Kit

Fits 2020 & Up Ford 7.3L Gasoline V8 Godzilla Engine

Part # 97-425
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Vehicle emissions regulations are not applicable to this item.

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Some engine swaps and racing applications do not need the heater, but it is tough to block off with the 7.3-liter Godzilla engine. The factory rear hose port is retained with a bolt (and the port is not tapped), and the front port is a tube with a hose barb that isn't removable. This kit includes a billet plug with an o-ring seal retained by a bracket and bolt, and the second plug is a rubber cap with a billet cover that clamps over the tube. These caps and plugs provide a more attractive appearance than other options.


  • Elimination of the heater is difficult on the 7.3-liter Godzilla engine since the hose inlet and outlet passages are tough to plug & look cobbled up using traditional hoses, clamps, and plugs
  • Machined steel billet plug with o-ring seal, mounting bracket, and retaining bolt – blocks off the rear port
  • Special rubber cap with clamp-on aluminum billet cover – blocks off the front port
  • Plug and caps designed to handle high pressure & high temperature – typical conditions of the cooling system
  • Easy Installation without the need to tap holes or fabricate special plugs and caps
  • Steel plug features a clear zinc plated finish, and the billet aluminum cap is black anodized – for a more attractive finished look (than other options)
  • Ideal for use in engine swaps or racing applications that do not require a heater

About Holley

Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From start to finish, Holley has the parts to make your dream a reality.

Brand Holley
Emission Code6
EngineFord 7.3 Godzilla
Product TypeHeater Block-Off Kit
Part Number97-425

Vehicle emissions regulations are not applicable to this item.
Note: The 7.3L engine design does not require a loop between the heater outlet and inlet. It is safe to block both ports off.

*Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

Some parts are not legal for use in California or other states with similar regulations.