Quick Fuel Technology 300-4013QFT Quick Cool Insulator For Use w/4150 Flange Carburetors Designed To Prevent Vapor Lock Quick Cool Insulator Fits Street Demon/Holley/QFT Carburetorswith 4150-style FlangesIncludes: (1) Open Plenum Spacer (1) Heat Shield (3) Non-Stick Open Flange Gaskets (4) 5/16" Manifold Studs