1968 455 98 exhaust problem

arnolds · 07-25-2007, 09:29 AM

[I'm new] I have a lovely 1968 455 98 convert I've been wanting to sell. It has a single exhaust with the LH manifold joined to the RH. There's a big leak where the RH joins the exhaust pipe. Looks like the 'bell' at the end of the manifold is rusted away.
Anyone know a possible 'fix' short of another manifold?
And/or: Where might I find a RH replacement (I checked Thompson, they don't have this I gather)
Last, is there a chance I could get a decent price as is? (new paint, new upholstery, good top and engine, no body rust.)
--Arnie

Oldsguy · 07-25-2007, 09:42 AM

Arnie,
post some pictures of the car in the for sale forum and see if there is any interest. You just never know till you try it. As for the exhaust problem, I don't think it would make THAT much difference, besides, you would end up just having to ask a little more to get the money out of the repairs you made, which is probably replacement as you indicated.

Olds64 · 07-25-2007, 12:40 PM

Are you sure it is the manifold that is rusted? I know as far back as 64 Olds used a small spacer on the driver's side manifold that housed a small bi-metalic spring which operated a shut-off valve. This assembly rusted pretty bad on my car and I took it out.

arnolds · 07-25-2007, 01:08 PM

My problem is only with the RH manifold where it joins the single exhaust pipe, The mounting end of the manifold is rusted so badly that it can't seal against the exhaust pipe flanges.

Olds64 · 07-25-2007, 01:22 PM

DOH! Sorry about that, I wasn't thinking.

You know, you might be able to have the manifold welded and repaired. Oldsguy and I had a welding shop modify a single exhaust manifold to accommodate duals. The shop did quite a bit of welding on that thing. I'm sure a good welder could repair your manifold. Then again, you have to justify the repair if your just going to sell the car.

arnolds · 07-25-2007, 01:53 PM

I think you are right that it is probably repairable. It may be wiser to weld a manifold that can be repaired than to trash it. These things are obviously scarce. We need not make them rare.

[Though about `69, I saw a shop in Texas welding a broken VW crank -- as in 2 pieces -- in a sandbox. VW cranks then were about $10. Now, they may cost you a dollar?]

2blu442 · 07-25-2007, 09:41 PM

I believe your pass side exhaust manifold has a large letter "T" cast into it. If that's correct I've got a couple of them in the garage, $25 plus shipping from Medford Oregon. I can supply photos if that would help. John

arnolds · 07-26-2007, 05:53 AM

I need to inspect mine, but from another site I've just seen that T is the descriptor for the 98 OLDS single exhaust.
It will be great to find a useable manifold.
Let me check!

07-25-2007, 09:29 AM	#1 (permalink)
arnolds Junior Member Join Date: Jul 2007 Posts: 9	1968 455 98 exhaust problem [I'm new] I have a lovely 1968 455 98 convert I've been wanting to sell. It has a single exhaust with the LH manifold joined to the RH. There's a big leak where the RH joins the exhaust pipe. Looks like the 'bell' at the end of the manifold is rusted away. Anyone know a possible 'fix' short of another manifold? And/or: Where might I find a RH replacement (I checked Thompson, they don't have this I gather) Last, is there a chance I could get a decent price as is? (new paint, new upholstery, good top and engine, no body rust.) --Arnie

07-25-2007, 09:42 AM	#2 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,779	Arnie, post some pictures of the car in the for sale forum and see if there is any interest. You just never know till you try it. As for the exhaust problem, I don't think it would make THAT much difference, besides, you would end up just having to ask a little more to get the money out of the repairs you made, which is probably replacement as you indicated. __________________ Dan '46 2 door

07-25-2007, 01:08 PM	#4 (permalink)
arnolds Junior Member Join Date: Jul 2007 Posts: 9	olds 64, thanks but My problem is only with the RH manifold where it joins the single exhaust pipe, The mounting end of the manifold is rusted so badly that it can't seal against the exhaust pipe flanges.

07-25-2007, 01:53 PM	#6 (permalink)
arnolds Junior Member Join Date: Jul 2007 Posts: 9	I think you are right I think you are right that it is probably repairable. It may be wiser to weld a manifold that can be repaired than to trash it. These things are obviously scarce. We need not make them rare. [Though about `69, I saw a shop in Texas welding a broken VW crank -- as in 2 pieces -- in a sandbox. VW cranks then were about $10. Now, they may cost you a dollar?]

07-25-2007, 09:41 PM	#7 (permalink)
2blu442 Senior Member Join Date: Sep 2006 Location: Medford, Oregon Posts: 801	Exhaust Manifold I believe your pass side exhaust manifold has a large letter "T" cast into it. If that's correct I've got a couple of them in the garage, $25 plus shipping from Medford Oregon. I can supply photos if that would help. John __________________ 1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished!

07-25-2007, 12:40 PM	#3 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 1,242	Are you sure it is the manifold that is rusted? I know as far back as 64 Olds used a small spacer on the driver's side manifold that housed a small bi-metalic spring which operated a shut-off valve. This assembly rusted pretty bad on my car and I took it out.

07-25-2007, 01:22 PM	#5 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 1,242	DOH! Sorry about that, I wasn't thinking. You know, you might be able to have the manifold welded and repaired. Oldsguy and I had a welding shop modify a single exhaust manifold to accommodate duals. The shop did quite a bit of welding on that thing. I'm sure a good welder could repair your manifold. Then again, you have to justify the repair if your just going to sell the car.

07-26-2007, 05:53 AM	#8 (permalink)
arnolds Junior Member Join Date: Jul 2007 Posts: 9	WOW, now we're talking! I need to inspect mine, but from another site I've just seen that T is the descriptor for the 98 OLDS single exhaust. It will be great to find a useable manifold. Let me check!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode