You only get one shot at making the hole straight, and if it isn't,
you'll never get the stud in. I do almost everything on my own when it
comes to cars, and this is something that I would consider having a
machinist do. I bet it wouldn't cost much more than $20 or $30, and
they have full length thread inserts that will be much stronger than a
helicoil. I don't like helicoils for this kind of repair, since they
get their strength by pushing out on the surrounding metal. That could
introduce some bore distortion that you don't want, in such a
relatively high torque situation. A full length insert would be much
> Bill -
> The stud that goes in that hole is pretty long! You don't want that
> hole drilled even the slightest bit offset or at an angle.
> I'd leave the drilling to a machine shop with proper presses and
> measuring tools.
> '53 BN1 '64 BJ8
> On 3/22/06, WWSCPO@aol.com <WWSCPO@aol.com> wrote:
> > Hi,
> > I am putting the head back on the block and have stripped the
> threads in the
> > block in one of the stud holes. I intend to helicoil the
> repair. I have
> > been told to use a drill with a magnetic base which will
> guarantee plumb.
> > Anyone have any experience or opinion?
> > Thank you,
> > Bill Schumann BJ8 38046