the 14 bolt holes in lower manifold were all tapped as well as the holes for the upper manifold/plenum. When I was torquing the lower bolts to 88 inch pounds one bolt just kept turning now I'm not sure. should I try buying a longer M6 or buy more lower gaskets and a helicoil and try to repair the one thread. There nothing to say that I get that one thread repaired and go to torque the bolts one more time and have the same experience with anther bolt. I'm running out of time fixing this engine. Do any of you guy ever use the Helicoil thread repair? bl2009