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cracked exhaust manifold, repairable or replace?
#1434502 Thu Dec 23 2021 03:26 AM
Joined: May 2017
Posts: 56
H
'Bolter
I removed my intake and exhaust manifold to clean and evaluate and there is a big crack in the exhaust manifold, see pics below. I assume I need to replace it but figured I'd ask if it's repairable, or if it is, whether that's even a good idea. The crack wraps around most of the manifold although I cannot flex it by hand (I didn't try to snap it in case it can still be welded).

If I replace it, should I look for another old part or is there something new I can bolt in its place? The intake looks OK.

Attached Files
IMG_2161.jpeg (649.95 KB, 282 downloads)
IMG_2162.jpeg (273.29 KB, 277 downloads)
Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434506 Thu Dec 23 2021 03:50 AM
Joined: Jun 2004
Posts: 8,527
W
'Bolter
Get a good used one. They are all over the place.
George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434510 Thu Dec 23 2021 04:17 AM
Joined: Feb 2004
Posts: 24,252
H
Kettle Custodian (pot stirrer)
That crack is in just the right place to put in a divider baffle to make a split manifold for dual exhausts. Otherwise, look for a replacement. There are offshore "clones" of the old cast iron dual exhaust headers, but they're pretty poor quality and don't fit well. The supply of original equipment single exhaust replacement manifolds and the Corvette six cylinder dual exhaust system dried up years ago. Good condition used ones are available- - - -try a "parts wanted" post here, and search Ebay also.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434538 Thu Dec 23 2021 03:24 PM
Joined: May 2017
Posts: 56
H
'Bolter
Thanks. I posted a wanted ad and will look locally and on eBay as well.

Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434542 Thu Dec 23 2021 03:46 PM
Joined: Sep 2010
Posts: 1,349
K
'Bolter
When you get a new one and you are not going to do anything with the old one I would salvage the spring and the heat riser flap and weight in case you need it in the future.


kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]
Re: cracked exhaust manifold, repairable or replace?
KEVINSKI #1434554 Thu Dec 23 2021 05:11 PM
Joined: May 2017
Posts: 56
H
'Bolter
Originally Posted by KEVINSKI
When you get a new one and you are not going to do anything with the old one I would salvage the spring and the heat riser flap and weight in case you need it in the future.

Good tip thanks. Those are all in good condition and functional.

Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434584 Thu Dec 23 2021 10:00 PM
Joined: Dec 2018
Posts: 1,450
F
'Bolter
Henrythe wound You could bolt that to a head,take a blue blade (thin grinding wheel) cut it completely in two weld with stainless. The trouble is the casting has lost most of it's carbon and is brittle now. Like us we've lost most of our carbon at this age LOL. Best bet is find a clean,straight,not to rusty replacement. Have several but there 2000 miles away, and are well rusted !!

Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434593 Thu Dec 23 2021 11:30 PM
Joined: Sep 2019
Posts: 102
R
'Bolter
They’re so plentiful I don’t even save them anymore if I scrap an unrevivable engine. I live in the city and don’t need codes officials breathing down my neck over parts I don’t need.


I invest my money in precious metals, mostly rust!
Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434612 Fri Dec 24 2021 03:34 AM
Joined: Jun 2004
Posts: 8,527
W
'Bolter
It looks to me there is another crack at the 1-2 runner.
George

Last edited by Wrenchbender Ret.; Mon Dec 27 2021 07:13 PM. Reason: 1-2 runner instead of 5-6 runner

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
Re: cracked exhaust manifold, repairable or replace?
HenrytheWound #1434762 Sun Dec 26 2021 12:10 PM
Joined: Mar 2002
Posts: 9,137
'Bolter
I bought one on Ebay a little while back. It was good but I had to get it planed. The part was nice but the shipping was a killer!

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