DonaldSmith Posted November 7, 2022 Report Share Posted November 7, 2022 The exhaust manifold on my 47 DeSoto has damage at the cast-in holes for the bolts that hold the exhaust manifold to the intake manifold, and at the exhaust pipe flange. Several years ago, I attempted to patch these areas with JB Weld. On driving to and from a car show last Fall, as I neared the end of the 40-mile trip each way, I sensed a strong phenolic smell from the engine compartment. I have the manifolds off now, and I see that the epoxy patches have been burnt. A welding shop advised against trying to repair the manifold. I am going to put in a want ad for a replacement exhaust manifold. I tried to read the part number. It could be 666376-4, or any one or more "6" could be replaced with an "8". Maybe someone verify the number, '47 DeSoto, 25-iinch block. Here's the main broken area, an angle I had put at the bolt heads, and what's left of the epoxy patch. (Upside down, I don't know why, maybe because I took the photo left-handed.) Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted November 7, 2022 Author Report Share Posted November 7, 2022 Actually, it's right-side up. as in position on the car. (The intake manifold outlet in the center of the photo has the hole for the infamous 13th bolt.) Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted November 7, 2022 Author Report Share Posted November 7, 2022 The number: (Upside down!) Quote Link to comment Share on other sites More sharing options...
Los_Control Posted November 7, 2022 Report Share Posted November 7, 2022 No idea if this helps, I flipped it and enlarged it some. Quote Link to comment Share on other sites More sharing options...
Los_Control Posted November 7, 2022 Report Share Posted November 7, 2022 (edited) The first # looks different then the next two 6's. ..... Possibly the first # is a 8 missing the sides? I'm guessing 8663TS-4 The S could be a 6 but looks slightly different also Edited November 7, 2022 by Los_Control Quote Link to comment Share on other sites More sharing options...
Sniper Posted November 7, 2022 Report Share Posted November 7, 2022 I see 588378-4, however that is likely to be a casting and not a part number so to the books I go, lol. I come up with this from my 1946-1954 Master Parts Catalog. Exhaust manifold, 1937-1950 DeSoto and Chrysler part number 666348 1 Quote Link to comment Share on other sites More sharing options...
Los_Control Posted November 7, 2022 Report Share Posted November 7, 2022 Just now, Sniper said: Exhaust manifold, 1937-1950 DeSoto and Chrysler Thats what I see .... just grab one & it should work? The #'s photo I see a huge guessing game where one player says I see yellow & the next player says I see blue! Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted November 7, 2022 Author Report Share Posted November 7, 2022 I just placed a want ad in the classified. I put in the part number that Sniper found in his parts catalog, 666348. The fifth number could be a 7 instead of a 4, but we'll see. The year range for the 25-inch engine should cinch it. Check your stash. See if you have an extra manifold lying around. Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted November 8, 2022 Report Share Posted November 8, 2022 1946-48 Chrysler shoud be the same. Quote Link to comment Share on other sites More sharing options...
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