Seller notes

1- new top quality heat isolator base gasket for Holley model 4150 & 4160 square bore 390-800 cfm 4 barrel carburetors. this gasket is a full 1/4" thick with inserts at the mounting holes to prevent over tightening and warping of the carburetor baseplate, and has throttle bore holes that are 1-11/16" in diameter. use of this gasket has shown up to 15 degree cooler carburetor and fuel temperatures resulting in a more dense fuel charge, better fuel mileage, and MORE HORSEPOWER! also works excellen...

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