I am working on a 68 GMC Tractor, I don't know what series it is because it has a 78 Chevy crew-cab pickup body on it, from the way it's built it is a BIG one...anyway, it has the 351E V6 engine that has the valve covers shaped like the 348/409 chevy v8 engine. The exhaust manifolds have a "flared bell-shape" where the header pipes connect...my friend had an exhaust shop put new dual exhaust on this but they didn't put the proper header pipe connector and what I have is a straight header that will push up into the manifold and of course fall right back out..Do any of you remember the 2 piece clamps that originally held these together and better yet, have you seen them for sale anywhere? I have called and researched to no avail...is it my imagination, or did those clamps exist? Does anyone have any ideas? I still can't believe that the muffler shop put these pipes into the cast manifolds, tacked-welded them, and expected them to stay anytime at all. I would like to find the header pipe flared connectors and clamps and fix this properly......LamarB
