The Chevrolet, GMC, and Workhorse 1998 through 2000 Exhaust Manifold Kit is an ideal replacement for specified vehicles. Made with durable cast iron construction, this kit includes an exhaust manifold, manifold gasket, flange, studs, and nuts. It is designed to resist warping, cracking, and leaking, ensuring long-lasting performance. With all necessary gaskets and downpipe hardware included, this kit provides a complete repair solution. Please note that it does not include a head shield. This kit fits most Chevrolet, GMC, and Workhorse 1999-2000 models with V8 454CID 7.4L and V8 454CID 7.4L gas engines. Direct OE replacement numbers are General Motors 12562999 and 12563000.