HOLLEY 4 BARREL HEAT ISOLATER BASE GASKET, AED BG DEMON EDELBROCK DEMON QFT

Description

1- new top quality heat isolater 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 a 15 degree cooler carburetor and fuel temperature resulting in a more dense fuel charge, better fuel mileage, and MORE HORSEPOWER! also works excellent to help prevent vapor lock on street driven and off road vehicles that experience high ambient air temperatures such as summer time here (typically 105-115 degree days!) also fits similar Demon, Grant, AED, Avenger, BG, QFT, Street Avenger carbs. NOTE...will not fit Holley 850-1000 cfm or similar carbs with 1-3/4" dia. throttle blades.