Exhaust manifold studs

[Purple73Cuda]

I forget, do all the exhaust manifold studs need to be sealed when installed into the head to prevent antifreeze leaks? I'm thinking it is only the back two on the drivers side and the front two on the passenger side.
I want to make sure. I don't want to have to pull the manifolds off again.
Oh, it is on a 383 engine.

[shadango]

I thought I could help until I got the very end of your post.....

On a small block, its the very back and very front ones on both sides....

I am sure someone will have your answer soon.

[Chryco Psycho]

All studs on a big block go into the water jacket
only the end studs on a small block

[Purple73Cuda]

I checked the driver's side head out last night. I first stuck a small screwdriver in to see if it bottomed. I then blew air into each hole. When I blew into the front hole I got antifreeze out of the rear two holes. Is my head different? Is it different depending on the year? I have '70 906 heads.
I sealed all the studs with Hi Temp Ultra RTV.
Does anyone know why Chrysler would build these heads so that the studs have to go into the water jacket?

[Chryco Psycho]

it is possible that the holes were not drilled deep enough to go through the casting or that the casting was extra thick on you heads so they do not go through , while Mopar did an amazing job designing the big block in the mid -late 50s the engine has some issiues , having the holes go into the water jacket has always been an issue for me but it may have to do with casting technology in the 50s , at least the head bolts do not go into the water jacket causing coolant to leak into the oil up the head bolts like all the chev engines do