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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Feb 2008 Posts: 1,123 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 1,123 | Saw a 235 with dual exhaust and it looked like the owner had cut a hole for an 1 1/2(?)exhaust pipe about 2 inches long to which he'd then welded a 2 inch diameter exhaust pipe and run it back and under the usual set up to the muffler. It looked clean and sounded good. Unfortunately, I didn't catch his name etc.. Anyone here done something similar for a 216? How? And any problems etc.? | | | | | Joined: Feb 2004 Posts: 29,859 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,859 | 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
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Aug 2014 Posts: 35 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2014 Posts: 35 | If you don't live in a very cold climate, is manifold heat even necessary??
Last edited by GodIsGood; 10/07/2014 5:37 AM.
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | yes, the stock setup works OK without the flapper functioning, but there is a lot of heat transfer just being bolted together. If you are using something where that juncture is separated, you need some type of heat. If it doesn't ever get below 40 degrees you might not see much difference, but it does make a difference
| | | | | Joined: Mar 2010 Posts: 10,299 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,299 | 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
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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