Quote Originally Posted by rspears View Post
I had not thought of that and it sounds reasonable, but while it was knocking I looked at the oil pressure gauge and it was normal, if not a bit higher than normal which I attributed to it being cold and me revving it a bit. I've never seen anything like this before.
So this must not make sense to anyone else, either. It started quiet again this morning, so I guess I'll just chalk it up to a coincidence and remember the date. Earlier in the day I had swapped out a leaky radiator, put on all new hoses, and changed the oil & filter. Nothing done would lead to lifters leaking down, which I'm assuming is what happened. Oh well.....