I did not see any visible signs of a cracked head or block when I had it apart but I must have overlooked it. Problem is I don't know how to tell which it is. It's not the head gasket now as I replaced that. It would be fantastic if it was just he head! Guess the only way to figure it out is take it all apart again and look much closer. But the fact it leaks down pressure into the crankcase must mean bad rings right? I mean is there any scenario that a cracked head or block leaks the compressed air into the crankcase?