As I was torquing down the head bolts to 20 foot pounds, which is what I read on another post, is this correcet? Anyway, six bolt on the port side started to get loose so I backed it out and found threading on the bolt.. So where do I go from here.. I barely tightened it maybe 10 foot pounds before it gave out.. all the others are fine please help is there away I can fix this?? I believe the bolt is 5/16 in diameter.