Thanks, Bob & others who sent comments.
One idea was to get an oversize stud, at least on one end, and helicoil at
the top of the block and use a short stud. I wouldn't want to enlarge the
hole in the head though so this would be a custom stud with different sizes
on each end.
If there were only a few threads engaged the first time around, maybe
cleaning up the bottom of the hole and chasing the treads might get enough
bite to try again. It's in an engine stand so access is good. He's going
to try this and if that fails, he already has found another head. That's
probably his best choice anyway.
Mike
-----Original Message-----
From: Bob Kramer [mailto:rkramer3@austin.rr.com]
Sent: Sunday, April 25, 2010 8:58 AM
To: M&M Hado; fot@autox.team.net
Subject: Re: [Fot] TR4A Stripped Threads in Block
I had one block were a previous owner must have done the same thing, I
couldn't get two studs to turn. The one in the front was easy, I could see
that a hole had been drilled and tapped from the side of the block an I was
able to get the set screw out after much effort. The long stud was harder to
identify and I finally figured out that the guy had drilled through the stud
hole into the bottom end and tapped that hole to match a threaded hole he
created in the long stud. After all that I junked the block because I have
spares, but if this is a restoration this technique would probably save the
block. Truth be told, if I just knew about the locked down studs before I
manhandled them trying to get them out I probably could have easy-outed the
set screws, or just left them alone.
Bob Kramer
Volente, TX
Perfection is not attainable, but if we chase perfection we can catch
excellence.
Vince Lombardi
----- Original Message -----
From: "M&M Hado" <mdhado@comcast.net>
To: <fot@autox.team.net>
Sent: Sunday, April 25, 2010 7:41 AM
Subject: [Fot] TR4A Stripped Threads in Block
>A friend just stripped one of the long cylinder head stud threads in the
> deep hole when the torque got to 90 ft-lb. It was hard seeing a grown man
> cry. My first thought is that the block is toast. I'm sure he's not the
> first so are there any suggestions for a fix? It's a street TR4A.
>
> Mike
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