I got 150-150-170-165 hot. Doesn't use oil or coolant, doesn't miss-fire or smoke. Pulls smoothly but lacks top end. Where is the compression going?
Adding oil didn't change the numbers any, so it must be a headgasket or valves. Wouldn't a headgasket use or push coolant? Are the head gaskets failing between cylinders? That would be about the only thing that would make any sense here. How many people have had valve problems? I would think that would be pretty low on the list of possible failures.

 

Those numbers could be a lot worse. 14 psi seems to be the limit between cylinders. Your only 6 psi past the limit from your highest pressure cylinder. I'd drive it around for the next week and baby it, then check your numbers again. I've seen cars repair themselves on numerous occasions.

 

Which cylinders are 150 , 170 , 165?

 

1-2-3-4
150-150-170-165

 

You stated you tried adding oil on the compression test.

Did you add enough to cover the whole piston ? Maybe about 1.5 ounces should do it.

Kinda hard to put the blame on valves since 2 cylinders are reading the same.

You could also pressurize each cylinder with compressed air and listen if it's coming out of the tailpipe ,intake , oil fill cap or the radiator fill neck.

 

I used plenty of oil and it didn't even budge 1 psi. I really don't think it's valves either, I just ran a can of MCCC through it and did another compression test and got exactly the same numbers. I'm borrowing a leakdown tester tomorrow, and I'm expecting to find a leak between cylinders 1 and 2. It's very odd to me that they are exactly the same number.