Exhaust manifold gaskets and using sealers

That product is usually used on a steel or copper gasket, if you had steel shim gaskets I would say yeah do it but with out any gasket I say no.
 
If I have an exhaust leak at the manifold to head interface, I take the manifold off and get it planed (surfaced) to get it flat again. Then I use a steel composition gasket to help insulate the manifold from the intense heat that likely causes it to warp in the first place. I think Chrysler was just too cheap to not put them in place the first time around.

Generally, I hate taking exhaust manifolds off of B engines though, at least in some years. I have found they had cheap studs in the head to hold the manifolds in place at least in 1969 and 1970. In 1971, they seemed to have improved the grade of the stud so they don't break with just very little torque applied to loosen the manifold nuts. If you break one of those studs, you pretty much have to take off the head and have the remainder of the stud removed and high grade studs put in or live with the exhaust leak. I have cursed the cheap engineers that made that choice many times.
 
If I have an exhaust leak at the manifold to head interface, I take the manifold off and get it planed (surfaced) to get it flat again. Then I use a steel composition gasket to help insulate the manifold from the intense heat that likely causes it to warp in the first place. I think Chrysler was just too cheap to not put them in place the first time around.

Generally, I hate taking exhaust manifolds off of B engines though, at least in some years. I have found they had cheap studs in the head to hold the manifolds in place at least in 1969 and 1970. In 1971, they seemed to have improved the grade of the stud so they don't break with just very little torque applied to loosen the manifold nuts. If you break one of those studs, you pretty much have to take off the head and have the remainder of the stud removed and high grade studs put in or live with the exhaust leak. I have cursed the cheap engineers that made that choice many times.

I was afraid of that....2 broken exhaust manifold studs on the D/S of my 70....head will have to come off....someday
 
Now cheap manifolds, you have to be speaking about all the 352-390 Fords 50's-70's. now those are some cheap manifolds. Ever hear one not cackling back in the day?
 
if you need a gasket/seal up uneven surfaces, Remflex. spendy, but they are the best, bar none.

Remflex Exhaust Header / Manifold Gaskets

Are those the 100% graphite ones? If so those were about to be my suggestion. I couldn't remember the brand name. I have used them on a 360 with one broken stud and a 383 with two! With success. Also great are the little ones that go between the exhaust manifold and flange. While I can't recall the brand I bought, I recall their slogan- If you don't like 'em you haven't tried 'em.
 
Are those the 100% graphite ones? If so those were about to be my suggestion. I couldn't remember the brand name. I have used them on a 360 with one broken stud and a 383 with two! With success. Also great are the little ones that go between the exhaust manifold and flange. While I can't recall the brand I bought, I recall their slogan- If you don't like 'em you haven't tried 'em.

I am not sure if they graphite or graphite-impregnated. I put them on my GTX a few years back (had a horrendous manifold leak) after trying everything but planing the heads. and voila! no more leak. and no leaks since.

and Remflex has a 100% satisfaction guarantee.

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They even have them for a 855 N series Cummins. Although I have never had one leak which is surprising with 3 cyl heads. Wonder if they have them for a 3406 Cat, I have never had one of those that did not leak.
 
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