New Venture owner here. I just purchased a 84 Venture. It has 36K on it and is cosmetically in great shape. The problem is that #3 cylinder is oiling out the exhaust.....alot. So much so that it will eventually foul the plug. Goes without saying that it smokes terribly. The kicker here is that it won't start smoking until the engine has been running for 2 or 3 minutes. I would think that if it were rings, that it would start smoking at startup. I am wondering if I have a cracked head, possibly near a valve guide that the crack opens up as the head heats up. Anyone have any opinions on this? BTW, great site. Lots of great info here.