> you probably have a 60/40
> chance..
IMO if you can tap a hole, you can install a Helicoil. I'm not particularly
good at working free-hand, and I've never screwed one up enough to have to
take other measures. Ruined an insert once, but only because I didn't turn
the tap deep enough. (Was threading a starter bolt hole that ran through
the mounting flange and into the bellhousing; didn't realize how thick the
flange was. Bolt jammed against the insert and came out with it attached.)
> ...If you
> screw it up you not only have the cost of a Helicoil kit but
> the cost of a new head.
There are inserts available that will work in a hole too big for a Helicoil.
For example:
http://www.timesert.com/html/bigsert_sparkplug.html
-- Randall
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