Alright, got the hole tapped and an insert loctited in. Have compression of 155-165 on all the rest of the cylinders, #6 has 90. Valves? #4 has 160 so I think that would rule out headgasket. Let me know what to look for, I figure I'll pull the head tomorrow but not sure what to look for. Oh yeah, I changed the oil last week and there wasnt any antifreeze in it, didnt smell of gas and antifreeze doesnt have oil in it.