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Old 07-06-2010, 04:19 PM
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identify 3 flange exhaust

was finally getting my stash of parts out of my Mom's garage (I'm 47!) & thought I had headers for a flathead, until I looked 'em over. please tell me what they are. 3 flanges, bolt holes are all straight up & down, center port is doubled (oval, as opposed to round), 8 1/2" from front to center bolt holes, 8 1/4" center to rear bolt holes. these parts have been in storage there for 30 years. was trying to round up my flathead parts & build a new engine, but somehow got these in the mix. any help would be appreciated. thanks - 1pickup

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Old 07-06-2010, 04:59 PM
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Pics might help?
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Old 07-06-2010, 05:12 PM
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Seems to me that the early Cadillac or Olds V8s had exhaust like that.
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Old 07-06-2010, 06:25 PM
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The flange shown is a 371 Olds from '57-'58. They are 4-tube, there were also 3-tube versions of them:



Cad flanges like for the 331 have bolts side by side. There are also 3-tube Pontiac headers, but they have side by side bolts and usually 1-3/4" centers w/1-5/8" ends.

OT- How's about these, for a Beemer:


Last edited by cobalt327; 07-06-2010 at 06:34 PM.
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Old 07-07-2010, 02:17 PM
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I was thinking they might be Cad or Olds, 'cause I found an eng/trans adaptor with this stuff that's an Offenhauser 0301. it mates '49-'64 Olds & '49-'54 Caddy to a flathead trans ('32-'48 Ford, '39-'50 Merc, & truck to '52). My father was into the swap meet thing, and anything having to do with flatheads became mine I guess, 'cause I had one since I was 13 or so. I'll see if I can get a photo put up & I know that would help. But, I thought with the measurements, somebody out there might have the engine & know off the top of their heads. Or, be nice enough to put the tape to theirs & compare. Thanks, & I'll work on that photo - 1pickup (by the way, that's a guitar reference, not a vehicle reference)
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Old 07-07-2010, 03:51 PM
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Quote:
Originally Posted by 1pickup
I'll see if I can get a photo put up & I know that would help. But, I thought with the measurements, somebody out there might have the engine & know off the top of their heads.
So, the flanges shown for the Olds doesn't look like what you have (w/the exception of the flanges shown have 4 ports, not 3)?

I don't know of any other common engine w/those attributes (3-tube, bolts over/under)- the flatty also has 3 tubes, but angled bolts over/under. AMC 250/287/327 engines had 3-port heads, but three bolts on the center port and slanted 2-bolt ends, a la flatty Ford. The Pontiac D-port was mentioned above.

The Olds is the only one I can recall w/bolts directly over/under and the possibility of being a 3-tube header. I'm kinda interested in seeing just what they're for.

Last edited by cobalt327; 07-07-2010 at 04:03 PM.
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Old 07-07-2010, 09:29 PM
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got a pic of the damn things. also, a pic of the adaptor I had with them. maybe some interest for this stuff on ebay or the hamb? I think I'm done draggin' stuff to swap meets, but ya never know...
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Old 07-07-2010, 09:30 PM
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oops, my measurements were wrong too. looks like 8 1/8" center to rear, & 8 1/4" center to front
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