Phenolic Thermal Insulating carb spacer. Manufactured from advanced phenolic thermoset plastic and engineered to withstand extreme high intake manifold temperatures, these spacer were designed to insulate and reduce heat flow to the carburetor keep it cooler to allow a denser fuel mixture to enter the engine and produce more horsepower. Four-hole bore manifold design 1" height. A must for any serious racing enthusiast.
This 1 inch tall phenolic thermoset plastic spacer insulates your carburetor against manifold heat keeping it cooler and helps prevent fuel percolation (also known as vapor lock) in hot weather. This can also allow for a denser fuel mixure to help increase performance in some applications, as well as provide additional plenum volume. 4-hole design fits Holley 4150/4160 4-barrel carbs as well as mo..
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