Allstar Performance ALL25980 4150 0.500" Hi-Flow Carburetor Spacer

The Allstar Performance ALL25980 4150 0.500" Hi-Flow Carburetor Spacer is made of phenolic plastic and is quite dense and stiff. However, a user reported that after a few hours of use, the spacer warped and distorted causing air leaks, thus not recommended for street or circle track use. Another user reported that the stud holes in the spacer were too small and chunks of the spacer broke off around the studs when they tried to remove it. They advised that they would not buy this product again. On the positive side, a user reported that the product worked as advertised, kept the heat off their carburetor, helped both the bottom and top end performance, and improved the efficiency of their dual plain manifold.