Ford 240/300 Intake Manifold Heater Kit

This product is designed for use with the Offenhauser PN 6227 (1x4bbl) intake manifold and headers. Offenhauser recommends PN 6227 for 4th Generation Ford in-line 6-cylinder engines (240 & 300 CID). This plate may fit OEM 240/300 cast iron intake manifolds but this hasn't been verified yet.

This intake manifold heater helps fuel distribution and minimizes off-idle bog by restoring a hot spot in the intake manifold floor. This product helps with cold operation even with fully cold water because even cold water has some heat to counteract the evaporative cooling effect of vaporizing gasoline. The heat replaced by the water vaporizes any puddled fuel under the carburetor that has fallen out of the air stream.

We are offering this product as a Basic Kit but a Complete Kit (with silicone hose and gear clamps) and a Bare Kit (with only the plate itself) are also available. We recommend splicing the plate into the return line from the heater core. This ensures that cabin heat is maintained at all times in cold weather.

This plate is machined from 3/8" 6061-T6 aluminum. It bolts onto the bottom of the Offenhauser intake manifold and has an attached 3/8" thick flow divider. The flow divider ensures that hot water circulates throughout the interior of the hot spot pocket. Elbow hose barb adapters are provided to ensure that the heater hose clears the exhaust system without any contact. The plate is equipped with 2 threaded holes so that the plate may be easily installed with 2 hands. Once snugged-up, the bolts are secured with lock washers and nuts.

The Basic Kit consists of:

  • 3 each of 3/8" nuts, bolts, & washers
  • 2 each of 3/8" NPT x 5/8" hose barb adapters
  • detailed installation instructions

The Complete Kit includes the following additional items:

  • 10' of silicone hose
  • 6 each of 5/8" ET-10 SS Gear Clamps

The Bare Kit consists of ONLY the plate itself.

We recommend the Complete Kit because of the heater's close proximity to the exhaust pipes. Silicone heater hose will not harden over time and will remain easily removable even after many years of service. The ET-10 gear clamps have an internal shield to prevent damage to the very pliable silicone hose.


Offenhauser has a warning cast into some of their intake manifolds stating "NOT FOR USE WITH WATER PLATE". According to a Ford Truck Enthusiasts Forums posting, Offenhauser intake manifolds are gravity tested and NOT pressure tested. Offenhauser puts the warning on their manifolds to avoid liability from pressure-related failures.


Please double-check the kit selection below before going the shopping cart's checkout.

Intake Manifold Heater Kit - Ford 240/300

  • $70.35

Available Options