hey all: Correct on oil out the breather and rings. Got the leak down test figured out. The average percentage is 12%. From research, it seems 5-10% is ok, at 20% or more you probably have a problem. If the compression is good like it is, and the leak down seems ok, then how can it be the rings? The only thing these two tests can't show is if the oil rings are doing their job. We have smoke out the exhaust, and the blow by out the breather. Both ring companies I spoke to said if you saturate the cylinder enough with oil, no set of rings in the world will seal. That's why I'm wondering if I had a leak large enough top side to overwhelm the rings and get blow by that way. The kicker is on the first rebuild the cylinder walls appeared normal, no sign of glazing. Also, Hastings rings said they found no residue of grease on the rings I sent them from the first rebuild. I think I've got it down to the rings or intake. I'll eliminate the intake and then have no choice but to tear it down. The heads are stock, no screw in studs.