There are actually three ways to use a stock exhaust manifold in a split configuration, but as Jerry notes, you need someone who can braze up the cast iron. I am sure arc welding or maybe tig welding may also be a possibility but with so much carbon in the cast iron I would imagine you would have to weld like I dry wall, 5 pounds on and sand 4 off.
So method one is a true split where you are splitting the manifold and welding the ends shut or weld in a baffle that essentially shuts off half the manifold, weld the halves back together, and then add an additional outlet on the half that needs one. This will result is a true split with the true split sound.
Method two, split the manifold, weld in a baffle with say a 1 inch hole in the baffle, weld the halves shut and add an outlet to the side that needs an outlet. This type split results in a somewhat tamer sound.
Method three, just add an additional outlet. Not a true split but allows for dual exhaust and is the quietest of the three methods.
I have never actually had a vette exhaust manifold in my possession. Fentons and clifford tube headers so I do not know what the vette exhaust manifold is, true split or just an additional outlet.
I have run Clifford headers since the late 70s. I like tube headers so I put up with the issues that can arise with them. But if I had to choose today between the fentons and maybe splitting a stock exhaust, I might go with splitting the stock exhaust particularly if the choke butterfly was still functional in order to retain th4e stock carb and choke heat functions.
Last edited by Dragsix; 10/20/2020 8:13 PM.
