Suitable for Holley 4150-4160, Carter, Edelbrock and other 4BBL carburettors

This 1-inch spacer made of thermosetting phenolic plastic insulates your carburetor against multiple heat and keeps it cooler. It also prevents fuel (also known as a vapor barrier) from seeping away in hot weather. This can also enable a denser fuel mix to increase performance in some applications and provide additional plenum volume. The open center design is suitable for Holley 4150/4160 4BBL carburettors as well as for most Carter and Edelbrock models with Squarebore design. Gaskets, studs, washers and nuts are included.