2 IN 1 CARBURETOR SPACER WITH PHENOLIC INSERTS2 in 1 Aluminum Carburetor Spacer Kit includes aluminum spacer, 2 phenolic inserts, 2 gaskets and all mounting carb-stud hardware required for installation.  Adapts a wide variety of 4 barrel carburetors to the Quadrajet intake manifolds.  Two Choices of Phenolic inserts that reduce heat to keep fuel temperature low for increased power. Two part numbers now available as one. Fits Holley, Edelbrock, AFB, Carter 4-hole and open manifolds.