F-134 exhaust manifold stud

I was adjusting the exhaust valves today on my f-head and pulled the manifold off to make it easier. When doing this the far left (when you're looking at it) stud came out with the nut attached to it (guess it was rust-welded together). I figured I'd just screw the stud back in when reinstalling the manifold, no big deal.

Well, when I went to screw the stud back in it, it went in until it was snug. After looking at it I realized I'd be better off just replacing the stud and nut with a bolt, so I backed it back out and when I took it out coolant shot out of the whole and high speed!

The only thing I can figure is that I somehow managed to push the stud through into the water jacket in the block. These studs don't normally go into the water jacket on an F-head do they?

I ended up sending the stud back in covered in Permatex gasket maker. It seems to be holding alright, but i'm afraid if I go at highway speeds for a long period of time, the pressure might eventually work its way through the permatex. I was thinking about maybe using plumbers tape and permatex.

anyone have any ideas? or has this happened to anyone before?

thanks,
evan

 

I don't know about the F-head but a lot of motors have bolts and studs that go into water jackets, putting permatex or thread sealer on them is normal.