[DeTomaso] Stripped Heli coils in Fontana Block

[Will Kooiman]

I had a similar issue in some aluminum heads several years ago.  I talked to an engine builder that was supplying parts to me.  He turned me on to Rockmount solid inserts.  They work like helicoils, but they are solid - not a spring.

This was 3/8ths though, and not as critical as head studs.  You drill slightly larger than what’s required by helicoils.  The insert cuts the threads. There are different brands of solid inserts, and I’m sure you can get them in several sizes - maybe even custom.

My point is it is fixable, but talk to the pros.  If possible, have them do the repairs.

Sent from my iPhone

> On Jan 30, 2021, at 9:53 AM, Steven Edwards <gsedwards at cox.net> wrote:
> 
>    Need ideas as to how to repair, if I can, stripped Helicoils in an
>   aluminum block.
> 
>   I have two 1/2' main studs that did not torque in a Fontana block.
> 
>   I pulled the studs to find that the Helicoils were being pulled up, and
>   stripping the aluminum threads.
> 
>   Can I repair these Helicoil threads? Any ideas?
> 
>   I Googled it several times, and all that comes up is how to install the
>   Helicoils in aluminum. Not how to repair the Helicoil threads.
> 
>   Thanks
> 
> 
>   Steven Edwards
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