The LCB [long center branch} header design was the BMC competition design for many years. In fact it is proving to be the best design for our Siamesed center port engines. This header is great for street and the race car. Our added design of making the header have a slip joint midway down, allows you to install without lifting the engine. If you are unfortunate enough to going offcourse or hit something in the road, you can replace only the bottom part, saving money by not having to buy the whole header. We do supply our competition manifold gasket with the header. This is made in America as it always has been of high quality steel.