> I always thought that the plain section was required to keep you from
> bottoming out the stud into the blind hole. True?
I discussed this exact topic with a professional mechanical engineer (and
Jaguar owner) a few years back. He said that for maximum strength, the stud
should not only bottom in the hole, but be torqued into place. This helps
spread the load into the deeper threads in the head/block, and prevent the
top thread from tearing out. (This assumes that the stud is a higher
tensile material than the head/block, which is normally the case.) The
whole thing still seems counter-intuitive to me, but he was a good ME
(retired now, I believe).
The plain section is to locate the thing being clamped (the manifold in this
case) as you should never locate against threads.
Randall
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