| BMora | -- 06-17-2010 @ 12:18 PM |
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I am having my 239 Flathead V8 rebuilt and the exhaust manifolds apparently "self destructed". The left one has a crack that may be salvageable, but the right one is in two pieces. I am finding some listings that have 8BA casting numbers, but thought that the 8RT used different ones that would start with an 8RT casting number. Any insight on sourcing viable replacements and part numbers would be appreciated.
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| trjford8 | -- 06-17-2010 @ 8:34 PM |
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If you are going to dual exhaust you might call Pat Rooney in Ohio(he's listed in the roster). Pat makes a new left side manifold for duals and may have access to some right side manifolds.
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| 51f1 | -- 06-18-2010 @ 10:06 AM |
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The 8BA and 8RT exhaust manifolds are different. Richard
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| BMora | -- 06-18-2010 @ 8:37 PM |
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So I cleaned one of the castings off and think I can read the casting number 21A-9431. This is not what I was expecting. I was expecting something like 8RT-9431. Is 21A-9431 a valid exhaust manifold? Is it the <strike>right</strike> correct manifold? How available are replacements? This message was edited by BMora on 6-18-10 @ 8:40 PM
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| 51f1 | -- 06-19-2010 @ 8:05 AM |
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I don't know about the casting numbers, but the part numbers for most 48-53 trucks are 7RT-9430 and 7RT-9431. The casting numbers would probably also start with 7RT. Casting numbers are different than parts numbers except for the prefix e.g., 7RT. Richard This message was edited by 51f1 on 6-19-10 @ 8:12 AM
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| BMora | -- 06-19-2010 @ 12:26 PM |
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I spent some time today cleaning up the pieces of manifold and this is what I was able to read off: On one, there is clearly 21A-9431 stamped On the other, there is 7RT-9430 stamped. I think that the 21A was used on 38-46 Fords. Can I use 8BA-9430 and 8BA-9431? I sourced those.
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| TomO | -- 06-19-2010 @ 3:26 PM |
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Exhaust manifolds are specific to the vehicle. If you have a pickup you should use the same manifolds that were on the car. Tom
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| BMora | -- 06-19-2010 @ 7:20 PM |
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I had the engine (239 V8 8RT) pulled and it is being rebuilt to be placed back into the same vehicle (1952 Ford F6 Cab). The existing manifolds self destructed. As stated above, one manifold is stamped 21A-9431 and the other 7RT-9430. I'm looking for advice on trying to source viable replacements. I'm guessing that I really need a pair of 7RT-9430/1 manifolds, but have not been able to find any as of yet. I have found an 8BA-9430/1 set and the bolt patterns and such match up and are used on the 239 for cars, but not trucks. If they would be functionally viable and wouldn't have to re-work the entire exhaust system, I would use them.
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| alanwoodieman | -- 06-20-2010 @ 1:04 PM |
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guys the exhaust manifolds for any flathead will work, but the problem is the truck water pumps and interference with truck dipsticks. 8Ba exhaust manifolds exit off the front and will interefere with the water pumps, probably why the 21A manifold was used-exits off the bottom, the repro dual manifold will not work on the truck because it interferes with the truck dipstick with rear sump oil pan
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| supereal | -- 06-20-2010 @ 2:22 PM |
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C&G has two kinds of headers that make good replacements for broken original exhaust manifolds. The tube headers don't require dipstick tube modification, but the cast iron set does. Finding specific unbroken exhaust manifolds has become a problem, and repros are about as, or more, expensive as headers. If you are not a purist, it is something to consider.
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| TomO | -- 06-21-2010 @ 8:36 AM |
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Bmora The parts book calls out the 7RT-9430/1 manifolds for your cab over. These were used in all 48-52 trucks and pickups with the 239 engine. Your best bet is to put an ad on a hot rod site where someone has put am modern engine in a pickup. If you want to put duals on it then have a muffler shop fabricate headers for it. Tom
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| BMora | -- 06-21-2010 @ 11:39 AM |
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Thank you everyone for all your input. I'm working on locating a pair of 7RT-9430/1 manifolds and have a couple of leads. However, I'm concerned because I pulled a 21A-9431 off of mine. Would it be possible to use a 21A-9430 as well as I may have to by them in sets? Can anyone explain or have pictures showing the differences between the 21A and the 7RT manifolds?
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| 51f1 | -- 06-21-2010 @ 2:00 PM |
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Anything is possible, but, as someone said above, manifolds are model specific. The proper manifolds are 7RT. Richard
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| TomO | -- 06-22-2010 @ 6:04 PM |
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The drawings in the parts manuals are too general to point out the differences. From what I remember there is a different angle on the right hand manifold connection to the "Y" pipe. There is so little room for modifications in the cab over, that I would be concerned about using the 21A manifolds. Tom
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| BMora | -- 06-22-2010 @ 7:25 PM |
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I have located a pair of 21As and will be taking my 7RT to the shop with me and physically comparing the manifolds and make my decision that way. Anyone who may have sourced the 7RTs, please let em know.
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| BMora | -- 06-26-2010 @ 5:25 PM |
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The only difference between the 21A and 7RT is about 1/8 of an inch in diameter of the inner holes. Everything else is identical (no problems with water pumps, dip sticks etc!!!!). I will be using the 21A manifolds I located unless the pair I see Monday are 7RTs.
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