67 L36 Exhaust Manifold repair

[Lawrence S.]

I have a broken "ear" on my passenger side exhaust manifold. I would like to repair this manifold. Any suggestions of where to get it repaired?

Thanks

Lawrence

[Michael F.]

Re: 67 L36 Exhaust Manifold repair

you need a welder who "KNOWS" and "REALLY KNOWS" how to weld cast iron, anyone is not capable as this is a hard weld to do. ask if they have done it before and how often. good luck.

[Joe L.]

Re: 67 L36 Exhaust Manifold repair

I have a broken "ear" on my passenger side exhaust manifold. I would like to repair this manifold. Any suggestions of where to get it repaired?

Thanks

Lawrence

Lawrence------


I don't recommend a repair. I recommend finding another manifold.

[Michael F.]

Re: 67 L36 Exhaust Manifold repair

I agree with Joe, but if you must repair follow my advice and don't be in a rush. again, good luck.

[Russ S.]

Re: 67 L36 Exhaust Manifold repair

Why not weld it? Nothing ventured, nothing gained. It's not a critical or safety part.

[Steve G.]

Re: 67 L36 Exhaust Manifold repair

The reason I wouldn't bother to weld it is because aside from the fact that an undetectable repair is near impossible, the probabilities of a lasting repair is so close to 0 that you are almost assured of having to take it off again. What's your time worth. What will the welder charge? What's another manifold worth?

I've been around the block more than once with repairing cast iron. But if you do go ahead, you will know you have selected a competent professional welder if he tells you it can't be done.

[Richard M.]

Re: 67 L36 Exhaust Manifold repair

I often take unconventional and different approaches to some of my repairs. Several years ago I did an experiment on a broken ear on a small block manifold exhaust pipe flange, a common problem when trying to remove the studs. After final dressing of the repair, it was strong and has lasted on the car several years, and is nearly undetectable. It was a mechanical repair that I undertook using my mill and donor pieces of cast iron.

Is the broken ear on the mount to the head, or to the exhaust pipe flange?

Rich

[Lawrence S.]

Re: 67 L36 Exhaust Manifold repair

I often take unconventional and different approaches to some of my repairs. Several years ago I did an experiment on a broken ear on a small block manifold exhaust pipe flange, a common problem when trying to remove the studs. After final dressing of the repair, it was strong and has lasted on the car several years, and is nearly undetectable. It was a mechanical repair that I undertook using my mill and donor pieces of cast iron.

Is the broken ear on the mount to the head, or to the exhaust pipe flange?

Rich

Rich,
It is on the head. The rear of number 7 cylinder.

[Richard M.]

Re: 67 L36 Exhaust Manifold repair

I'm unsure if my method would work on that, as it's a critical mount point. I'd need to see photos of the broken area. If there is a portion still able to hold part of the bolt, i.e. protrusions of the tab, it may work.

If you would like to see how I did my repair please send me a PM with your email address and a few photos using the "Image" icon, and I can show you how I did it. If you have a local machine shop to work with it may be feasible.

Rich

[Curtis M.]

Re: 67 L36 Exhaust Manifold repair

Lawrence,

I had an ear at the exhaust pipe flange welded about 11 years ago. It cracked during removal of the stud. It was fixed using nickel powder. I checked it just this year and the repair still looks solid. I agree with Michael in finding someone who really knows how to do this. I talked to a lot of people before finding a welder I was comfortable with. I had a manifold I just couldn't find every day so the repair was worth it to me. Like Richard said though, I'm not sure this would work on an attachment point on the head. You're not that close to me, but send me a PM if you'd like the guys name. If nothing else, you could probably speak to him about it.

Good luck,

Curtis

[Jim D.]

Re: 67 L36 Exhaust Manifold repair

Talk to a mechanic at a motor home dealer. Motor homes with big block Chevy's were known for cracking exhaust manifolds. Find out where they send them to be repaired. There is absolutely no reason not to have it welded. I've had big block manifolds welded and never had a problem with any of them and with a little detail work, it's almost undetectable. The repair requires pre-heating the manifold and using the correct welding rod, a Ni rod if I remember correctly.

[Joe L.]

Re: 67 L36 Exhaust Manifold repair

Here's how I see this: having this manifold repaired by a competent welder is not going to be a 25 buck weld job. Good used original manifolds are not rare, although they can be a little pricey. Nevertheless, it's no doubt going to cost more for a good used manifold. However, which would you rather have? A repaired, original manifold from your car with correct date (if, indeed it actually is an original manifold from your car with correct date) OR an non-repaired, original manifold from another car (possibly, without correct date). For me, especially for something like an exhaust manifold, I'd ALWAYS go with the non-repaired manifold.

[Domenic T.]

Re: 67 L36 Exhaust Manifold repair

I have used silicone bronze rod with a TIG welder and it worked OK on a NON structural surface. A mount to the head would seem to be risky at best. The problem I find welding exhaust is that the carbon content is high due to the many times it was heatied and cooled off. Another problem is that the weld MUST be peened with a sharp welding pic to keep it from cracking at the edge of the weld. The best way is to heat cast red hot and weld it while it is still red hot then stretch the weld by peening it. I have admired a cast weld only to hear a crack when it cooled because I didn't peen it till it cooled.
Buy a good used one.

Dom

[William F.]

Re: 67 L36 Exhaust Manifold repair

The Z28 (has a video showing setting drag record in old Reliable") and carb restorer guy, having a brain freeze for name, repairs cast iron manifolds, He shows some on his web site. What's his name, guys?

[Richard M.]

Re: 67 L36 Exhaust Manifold repair

The Z28 (has a video showing setting drag record in old Reliable") and carb restorer guy, having a brain freeze for name, repairs cast iron manifolds, He shows some on his web site. What's his name, guys?

Jerry McNiesh? (sp?)