If you are looking for a manifold to use with your 8-71 or 6-71 supercharger, look no further than Speedmaster. These Speedmaster 8-71 and 6-71 supercharger manifolds are aluminum constructed and suitable for competition or street use. They feature: Heat treated cast aluminum Direct 6-71 / 8-71 blower bolt on Will clear distributor (except Hei) Raised plenum for better distribution of air Threaded water ports near water outlet 5-3/8" manifold height 2" x 1 1/4" Intake Ports