I am working with an 86 with a 2.8. Got the car running, but realized it was leaking oil terribly, needed new valve seals, amongst other things. Upon placing the head bolts back in, one of them will start a few turns, but then gets hung up less than half way down. I ran PB blaster and a wire brush through the hole in hopes of cleaning it out, but to no avail.the threads appear to be stripped. I tried another Bolt, and same issue. But the original Bolt works in another hole, so I know my bolts are fine. My question is, what size Tap should I chase the threads with? And is this safe to do with the head on? Or does it need to come back off? From what I am reading and what I have seen, it looks to be maybe an 11MM X 1.5 or 11MM X 1.75, but I'm not certain either way. Can anyone shed some light here?
