Re: Helicoil BBC Exhaust Manifold Smog Holes?
Check out Keenserts. They are solid thread repair inserts versus the wound wire in a helicoil. You would have no chance for exhaust leakage with these inserts.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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