Gentlemen,
Do you know of a high temp epoxy that can be used inside a piston exhaust
port? An exhaust stud has stripped out; it requires a Timesert (or
helicoils) plus the head of the stud extends into the inner port.  Any
experience?
Marc Wiese

I don't think any epoxy would stand up to that temp.

Paul Lamar

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Hi -----------don't shot me and I don't recommend it and would not do it
myself.  However I do know of an acquaintance that striped a spark plug
thread on a VW powered plane and glued it back in with JB weld has flown
several hundred hours with no further problems. (No idea how or if he has
cleaned or checked that plug since).   Also a similar type also with a VW
burned a neat hole just like an acetylene torch had been run down the side
of the spark plug that had not been tightened properly, that resulted in a
big hole in the field and hospitalization for both occupants.

NB Paul, I understand if you decide not to post this.

Clive UK

That is different than an exhaust stud. The temperature is a lot
lower. Below 500 F and JB Weld claims 650 F. I put a left
over puck of it in an oven to see what happens at 500 F. It
becomes more rubbery. You can throw it on the hard floor
and it bounces :) It is a rather strange composite material
consisting of iron powder and epoxy.

Paul Lamar