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Mr. Gasket Phenolic Thermal Insulating Carburetor Spacer - Quadrajet Four-Hole Design 11001 Wastegate open pressure setting forMr. Gasket Phenolic Thermal Insulating Carburetor Spacer 3406 Quadrajet Four Hole Design 1" Thick Includes Gaskets Studs Nuts Washers Race Only Advanced Phenolic Thermoset Plastic Withstands Extreme High Temperatures Insulates Reduces Heat Flow Allows Denser Fuel Mix Produces More Horsepower Using his own 57 Chevy as a rolling test bed, drag racer Joe Hrudka launched the most famous gasket company in the world more than half a century ago (started in