When I had my exhaust system replaced last year, my mechanic removed the original studs in the heads, put in helicoils and new studs to hold the pipes to the heads.  When I had problems with the nuts falling off the left rear studs, the studs were replaced with 8 mm bolts.  Yesterday, I heard the familiar click-click from the engine.  When I went to tighten up the bolts, the bolts would not tighten.  It felt like the helicoils were turning.

What should I advise my mechanic to do?  I have an '84 with 1.9L engine.  Could be original heads, but I am not interested in doing a head job at this time.

John Lauterbach
Macon, GA

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