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Tractor Talk Discussion Forum

splitting exhaust manifold/duals

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n8terry

08-28-2007 07:32:00




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I have a flat head 6cyl that I want to split the exhaust on. If I could take the head in with the exhaust manifold it would be a lot easier. As you know this option isn't possible with a flat head.

My concern is to do it in such a way that the alignment of the manifold with the engine isn't screwed up.

Please don't come on here and tell me I am crazy, I already know that.

thanks for any advice some of you OT (old timers)may have.

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p55

08-29-2007 16:41:44




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 Re: splitting exhaust manifold/duals in reply to n8terry, 08-28-2007 07:32:00  
You didn"t specify which engine you are working on, but Dodge did make split 3/3 exhaust and intake manifold for several truck engines. I saw one last Saturday at a rod and custom show on a 53 Dodge 1/2 ton. Had two Carter B&B carbs .
I"m not sure which engine was in it (short or long block) but I do know that the manifold was NOT hand made but actually factory equipment. You"ll need to try over in the truck forum.

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Brian G. NY

08-28-2007 18:07:59




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 Re: splitting exhaust manifold/duals in reply to n8terry, 08-28-2007 07:32:00  
I'm 66 and I still love the sounds of dual glasspacks. The Flathead V-8 with duals had a sweet sound but back in my days a Chevy or Mopar with the Fenton "split" manifold and dual glasspacks sounded just as sweet.
I think Fenton cast iron manifolds are still being sold for the Ford flatheads and the GM sixes but I'm not sure about the flathead Mopar sixes. I'd do some searching on the internet. No doubt, if available, they would be pricey but it sure would be a lot easier,

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J.C.in AZ.

08-28-2007 12:48:59




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 Re: splitting exhaust manifold/duals in reply to n8terry, 08-28-2007 07:32:00  
Really going back here. In 1953 the thing to do was to "Split The Exhaust Manifold and rig up Duals" Well I was in Ag. Class and during a portion of the Class we had shop. I took the Manifold off my 1938 Dodge Six Cyl. to the class and when the Teacher was not looking ,with Acet/Oxy Torch blew a hole in the bottom of the manifold about 1 1/2" Dia. Brazed on a pc. of Exhaust Pipe the size to fit into a Flex Exhaust Pipe. Took it home and put the manifold on the car, got 6' of Galvanized Flex Pipe for the new outlet. Replaced the Muffler with a Pc. of Pipe on the other side and went to Town Cruising.Long story short, got arrested and car impounded. Dad knew the J.P. so I got out of that one,Car went to the Junk Yard I guess,I never saw it again. I think my Dad had something to do with that although he never said and I never asked. If you knew my Dad you know what I mean. Bt this time it was 1954 and I cruised thru life until July 27,1955 when I went to the Marine Corps and that lasted 8 years. No regrets in my life but I still wonder what happened to my "1938 Dodge Sedan"

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Cosmo

08-28-2007 16:16:36




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 Re: splitting exhaust manifold/duals in reply to J.C.in AZ., 08-28-2007 12:48:59  
J.C., I did the same thing on a '50 Plymouth in my younger days. I was impressed with the noise. Dear old Dad wasn't. Had to undo it. Regards, Cosmo



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george md

08-28-2007 09:24:54




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 Re: splitting exhaust manifold/duals in reply to n8terry, 08-28-2007 07:32:00  
Terry,

A few questions are in order first. Are you
going for 3 & 3 cylinders or 4 & 2 ? Are you going to block the two halves between 3 & 4 and
what are you going to do about the heat exchange
from the exhaust to the intake? Is it going to be
center and rear drops or close the center and
have drop in each end?

I do quite a bit of manifold repair and all
with oxy/acetylene weld .

Below is a link to some repair.

george

third party image

Showing back of the broken heater box


third party image

assembled box , back side

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Bob

08-28-2007 07:55:00




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 Re: splitting exhaust manifold/duals in reply to n8terry, 08-28-2007 07:32:00  
Could you find a spare engine block to attach the manifold to for the procedure?

Otherwise, how about a thick piece of steel plate, with holes carefully drilled in it to match the block, perhaps using a new exhaust gasket as a pattern?



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Wayne in Tx

08-28-2007 07:48:42




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 Re: splitting exhaust manifold/duals in reply to n8terry, 08-28-2007 07:32:00  
I don't know about a flathead specifically but, I had a set of headers made by a local exhaust shop that added dual exhaust to a Chevy OHV 6 cyl. The exhaust shop that made them did it pretty cheap ~ $150 - $200.



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steveormary

08-28-2007 13:15:01




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 Re: splitting exhaust manifold/duals in reply to Wayne in Tx, 08-28-2007 07:48:42  
Wayne in Texas

Dont remember how we did it but I had a split manifold on a 1950 Chevy. Only got stopped once for loud pipes. If the engine wasnt warmed up the were pretty loud.

steveormary



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Larry in Mo

08-28-2007 09:22:57




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 Re: splitting exhaust manifold/duals in reply to Wayne in Tx, 08-28-2007 07:48:42  
Not knowing what engine you have or how much room to work in, but here's what I did on my '50 Chev years ago. Take the manifold off or get a spare. With a center punch make a series of punch marks to outline a slot in the side of the manifold. Made mine 1/4" wide and stay inside the top and bottom. With a 1/8" drill or a litle larger drill out the punched outline and then take a cold chisel and knouck out the remaining metal. Cut a block to fit the slot you've made and weld it in. Doing it that way, you maintain the alignment of the manifold, as you never cut all the way through. LE
PS; Make your punch marks a little wider than the drill you'll be using. Leave some material between the holes, and it will knock right out.

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