Long before the Fenton (and other) split header systems became popular, people would weld a second exhaust pipe flange onto the stovebolt exhaust manifold and weld a blocker plate in, creating a "split" manifold. Done properly, each cylinder in the firing order used a different pipe- - - -1,2,and 3 down the front pipe, and 4,5,and 6 from the rear. Because of the firing order, the exhaust pulses alternated from one pipe to the other. Some people think splitting a stock manifold is better than using Fentons, since the heat riser stays functional and it's not necessary to cobble up some sort of carburetor heat system.
Jerry
Jerry, what happens it you don't put in the blocker plate? I am trying to avoid the annoying inline six dual exhaust clatter when you lay into it. I was wondering if leaving out the plate would act similar to a cross-over generally used in the exhaust pipe further down stream. I am also trying to get out of extra work.
Carl
