Yessir. I don't recall the name of the manufacturer. A copper gasket onto an internal wrenching threaded male steel fitting through the header and iinstalled into the female threads of the aluminum motor head using a large allen wrench. An internal wrenching aluminum threaded cover was then installed on the header to seal the deal. Always tight when cool, gradually loosening when motor gets hot. Mine kept coming loose on my 140 Sport and 140L motors and after repeated attempts to tighten when hot, the wrenching forces exerted on the aluminum cover plate with the large allen wrench would ruin the cover plate. If not careful, could ruin the female threads on the motor head.