Offenhauser intake manifolds are cast of high-grade aluminum alloy, expertly engineered and precision machined . . . manifolds provide increased power, economical operation, and a smoother, better-balanced engine. Equalized fuel distribution to all cylinders allows engine to operate at maximum efficiency throughout all stages of RPM . .. in addition, the custom appearance of our products is a great improvement where pride of ownership is prevalent. All manifolds on t his page are complete with throttle brackets and instructions unless listed “less kit.” Our valve covers have special finned-top, cast-aluminum alloy and highly polished for added engine beauty. Valve covers help reduce engine heat and rocker arm noise.