These manifolds are available for the small and big block Chevy and are able to be used with either a 6-71 or 8-71 Weiand supercharger. This design also allows the use of OE style water outlets with the pop-off plate mounted at the rear of the manifold. The SB-Chevy manifold will not fit 1993 and later LT1 heads and may require slight elongation of the four center manifold mounting holes for installation on some late model cylinder heads. Available in satin or polished aluminum.