MTFCA Forum

Today I was adjusting my exhaust manifold because it wasn’t aligned with my ring gasket and while I was tightening down the clamps, the bolt felt like it was going no where. I backed it off to find this. I was using a box wrench, no power tools. Would it be salvageable or should I just replace it. If it is fixable, what size is the thread?

Thanks, Jacob Mangold

Remove and replace. It is a simple job.

Until you can get a replacement, take it out, run a 3/8-24 die on it to clean up the threads, then put that end onto the block, and put your manifold clamp back on. Run you nut on tap to clean up your threads and put it back together...

Ok, I will do that. I was still able to run the engine without the clamp with no loss of power or issue. It was able to drive fine.

Thanks, Jacob Mangold

I use brass nuts there. No chance they will rust in place. Are they strong enough? Yes.

If you have a later manifold clamp in your stash, it will fit opposite way around, and you will still get full thread engagement. You can then replace it at your leisure.

I would DEFINITELY NOT run without the clamp. The rear port is subject to most heat, and if the manifold is not clamped tightly, you stand a good chance it will warp, making it difficult to fit later.

Allan from down under.