440 Stock Exhaust Manifolds questions?

[68wanabee]

I have a 68 Coronet with a 440 in it and have the standard exhaust manifold gaskets installed, I was wondering are there some better gaskets, as I have thought about doubling them up just to ensure I am getting a good seal and they are not leaking? It seems they are pretty thin and my not create a great seal. Additionally, the bolts that go from the exhaust manifold to the exhaust pipe are difficult to tighten as they spin and getting the proper wrench on theme is a challenge. I understand there are some special ones that have tabs on them to keep them from spinning, but I have not been able to locate them on any of the sites. I was hoping one of the members could direct me, you feedback is always appreciated.

 

[AMX364]

I welded a metal finger on the bolt head to limit the spin that is possible. Not stock but user friendly. Make fingers at least 1/8 inch thick for good welding.

Some B engines did not use a exhaust gasket from the factory. If it leaks try a different brand or machine the head and exhaust manifold flat(expensive machine work) or use Hi temp sealer.

 

[68wanabee]

That was what I was thinking on doing since seems like there is not place to source the new bolts. Appreciate the feedback and suggestions.

 

[440 Cuda]

I welded a metal finger on the bolt head to limit the spin that is possible. Not stock but user friendly. Make fingers at least 1/8 inch thick for good welding.

Some B engines did not use a exhaust gasket from the factory. If it leaks try a different brand or machine the head and exhaust manifold flat(expensive machine work) or use Hi temp sealer.

Correct,

At least have the Exhaust Manifolds checked for out-of-straightness.

Some Machine Shops use a Belt Sander Surface Grinder on the Exhaust Manifolds to provide for an even mating surface.

 

[Photon440]

No exhaust manifold gaskets on my car. Both my 383 and 440 came from the factory without them and they seal fine. Like 440 Cuda said, they have to be straight.