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Broken exhaust manifold stud hole

 
Old 04-08-2019, 10:25 PM
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Railroadman
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Default Broken exhaust manifold stud hole

The right side exhaust manifold (327/250) has a piece cracked off at the bottom. What's the thoughts between having a welder build it up and re-bore, vs. buying a replacement?
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Old 04-08-2019, 10:31 PM
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Weld and bore. Fairly standard repair.
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Old 04-09-2019, 07:53 AM
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If the welder is sufficiently talented, it can be very effective and almost as good as new.

The challenge is to get the new hole/stud parallel to the other two studs. If they aren't parallel it can be a bear to get the header pipe attached. Then you may find yourself having to screw the repaired stud into the manifold last to get it to fit.

New reproduction manifolds are not that expensive. What is your goal for the car? A driver or a judged car?

Good luck... GUSTO
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Old 04-09-2019, 08:13 AM
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Used manifolds are cheap and plentiful.
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Old 04-09-2019, 08:17 AM
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If you can find someone to weld it properly is the question. I have an attachment that goes on an acetylene irg that works very well for gas welding cast iron. You use cast iron for filler so it produces a really nice weld. It's still not easy. Stick welding it with nickel always produces a crust between the parent metal and the filler because of the heat differential. This crust is extremely brittle and it may break there and the crust is very hard to machine and tap. I would just get another manifold.
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Old 04-09-2019, 09:51 AM
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It will be a driver so I don't have to keep the original. And since it's a 2" exhaust I suppose they are in less demand than the 2 1/2's.

Anybody out there got a good deal on a 3750556?
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Old 04-09-2019, 03:37 PM
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Originally Posted by MikeM View Post
Used manifolds are cheap and plentiful.
My first thought as well. Probably cost half as much to buy a good used one as it would for the labor to fix the old one. At least in my area. Skilled labor is $$$ these days.
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Old 04-09-2019, 03:48 PM
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Originally Posted by GTOguy View Post
My first thought as well. Probably cost half as much to buy a good used one as it would for the labor to fix the old one. At least in my area. Skilled labor is $$$ these days.
A few years ago, those manifolds were laying around everywhere. So much a pound. I had to look on Ebay after I posted. I see one of your fellow countrymen out there has a couple for sale for $300+$ David something or other is his name.

You can buy a repop for about $50 if you can't find one somebody will give you to get it out of their way. Should be plenty in the bone yards or or engine core shops.
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Old 04-09-2019, 04:29 PM
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Mighty few boneyards have '70s or earlier cars or parts anymore.

They are called auto recyclers, now, and they don't have a back 40 full of old iron like the old days. Its damn hard to find original stamped steel 1960s SB covers without paying a fortune, anymore, they used to be free or almost free, everywhere.

Doug
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Old 04-09-2019, 05:02 PM
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Originally Posted by AZDoug View Post
Mighty few boneyards have '70s or earlier cars or parts anymore.

They are called auto recyclers, now, and they don't have a back 40 full of old iron like the old days. Its damn hard to find original stamped steel 1960s SB covers without paying a fortune, anymore, they used to be free or almost free, everywhere.

Doug
I guess it depends a lot on where you live. I have access to several places like I mentioned above.
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Old 04-09-2019, 05:40 PM
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Originally Posted by Railroadman View Post
It will be a driver so I don't have to keep the original. And since it's a 2" exhaust I suppose they are in less demand than the 2 1/2's.

Anybody out there got a good deal on a 3750556?
https://bgky.craigslist.org/pts/d/bo...835764614.html
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Old 04-09-2019, 08:18 PM
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Originally Posted by AZDoug View Post
Mighty few boneyards have '70s or earlier cars or parts anymore.

They are called auto recyclers, now, and they don't have a back 40 full of old iron like the old days. Its damn hard to find original stamped steel 1960s SB covers without paying a fortune, anymore, they used to be free or almost free, everywhere.

Doug
Even down here in Misipy there are virtually zero old cars left in regular junk yards. I took off on a 10 hour route a few years ago in search of 67 GTO/ Lemans quarter panels. Not the entire panel just the upper rear. Stopping at every yard I could find in 100 miles I found nothing. They all said a guy had come through a few years earlier and bought my 60/70s stuff that was left. There are a few private yards but if you don't know them you can't get anything. I did finally get a pair from Montana.
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Old 04-09-2019, 09:03 PM
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Old 04-10-2019, 05:06 PM
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Here is one for you, free of charge, how is that for a deal?
I've had it laying around for years m, it came with an old 283 I had bought.
I'll even ship it to you for free, PM me an address.



Last edited by Rob_64-365; 04-10-2019 at 05:09 PM.
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Old 04-10-2019, 05:13 PM
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You won't beat that deal.
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Old 04-10-2019, 05:15 PM
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Hey if I sandblasted it, and coated it for him, it would be a better deal, but I'm not going that far with this!! Lol
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Old 04-10-2019, 06:16 PM
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Looks like it also may come with free dead spider also!.

That is mighty generous of you. I give away old parts now and then, but always asked for shipping costs, as they have gotten quite stratospheric.
Doug
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Old 04-10-2019, 07:18 PM
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I think that's a crusty fish fly skeleton, they get really thick around here in late june.
This manifold has been sitting on a shelf for years, happy to get rid of it to a fellow Corvette brother in need of it.
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Old 04-10-2019, 07:40 PM
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Rob, thank you very much, I'll accept! I'm more than happy to reimburse you for the shipping etc!

We just got back home, I will PM you later after cleaning our some room in my PM box!
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Old 04-10-2019, 07:59 PM
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Gee, I don't know but I don't think you'll find a better deal than that.

Nice move, Rob.

Last edited by Easy Rhino; 04-10-2019 at 08:00 PM.
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