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OK,I am trying to install the horns and their bracket on my 2103, freshly rebuilt 356. The horn bracket mounts on the head studs (nos. 11 and 36 on the tightening sequence chart). Problem is with no. 11. With the thickness of the bracket, the stud did not protrude far enough for the nut to thread completely. I removed the stud and found that one end is threaded for about 7/8", and the other end 5/8". If I reverse the stud, it bottoms out sooner, and I gain enough length for the head nut to thread properly. Is it OK to do this?

Follow up question - no. 11 stud is in the inner part of the head and enters the water jacket. I think the bracket goes first, followed by the washer then the head nut. How should I ensure no leaks here?

Thanks,
Mark

One problem in reversing studs might be if your engine has the rolled thread type stud as detailed in this article. The threads are just different enough to cause issues if the wrong end is installed in the block. If the stud goes in easily from both ends then it is probably the cut thread and I don't see an issue reversing it. I would use some sealant around the threads -- something like Permatex high temp sealant should work well.

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For sealing threads that go into water jackets I've been using good old Indian Head Gasket Shellac for a long time, never a leak.