When removing the 235 the PO simply cut off the exhaust pipe with a Sawsall leaving a 16” stub. The flange is welded to the pipe. Once the engine is installed in my truck should I just leave this small pipe in place and weld the new exhaust pipe to it, or should I try to buy a new flange and have the muffler shop weld it to a completely new pipe and go that route? I assume one of the suppliers sells just the exhaust flange.
Chuck 1950 Chevy 1/2 ton (all original) 1951 Chevy 1/2 ton (future streetrod) 1941 Chevy coupe 1938 Chevy coupe streetrod
Why would you even want a rusty header pipe connected to your new engine?
I don't think the flange has to be welded to a new pipe. It can just slip over the header pipe and stop at the flared collar. \ Are you sure the old one is welded? Maybe it's just rusted in position.
Last edited by Otto Skorzeny; 03/10/20221:30 AM.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
The flange should just slide on the pipe ,when you get your new exhaust they will make it in a few pieces and slide a new flange on with a new donut seal I copied the bend cards if you bring them ti the muffler shop they might help.
Just about any exhaust shop worthy of the name will either have the right flange in stock or at least have access to one. I doubt that the flange is actually welded on- - - -the pipe is probably swaged into the proper shape to seal the bottom of the donut and and then expanded to be a tight fit to the flange. The guy who builds my exhaust systems can do some amazing things with that hydraulic pipe bender. Of course, he's an old geezer like me with 50-something years of experience bending pipe. 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!
As you can see, the flange is welded to the exhaust pipe on the backside where it exits the flange. Nice bead weld. There’s no separating the two. I think I like the idea of letting a good muffler shop fabricate a new exhaust system using all new pipe and a new flange. Thanks Kevinski for those bend cards. They might come in handy.
Chuck 1950 Chevy 1/2 ton (all original) 1951 Chevy 1/2 ton (future streetrod) 1941 Chevy coupe 1938 Chevy coupe streetrod
OK- - - -that one is probably a factory made direct replacement exhaust pipe, or possibly an original equipment one, although that's highly unlikely, given the tendency of exhaust systems to rust out. Walker, Arvin, and a few other exhaust manufacturers used to sell bolt-on replacement parts, back when there were enough vehicles on the road to justify tooling up to make thousands of pipes at a time. 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!
