Mr. Gasket 86 Quadrajet Heat Dissipator Prevents engine heat from vapor locking gas in the carburetor Delivers a smooth transition of the air and fuel mixture to the intake and increases flow for optimum performance Made from heat absorbing layers of a special aluminum alloy .250 inch thick Ideal for 4 barrel spread bore Rochester Quadrajets Insulates the carburetor from engine heat doubles as a mounting gasket and provides added clearance for linkages