[jrvariel48]

I have low compression on my #2 cylinder(35 lb's). I found it by pulling the plug wires while the motor was running and there was no rpm change on that cylinder. The motor was warmed up at that point. I ran the motor with the spark plug removed to see if the valves were moving and they were. It looked to me like the intake valve wasn't traveling as much as the exhaust valve.
The motor is a 1946. Compression on 6 of the cylinders is 110 lb's and one at 85 lb's. When the motor is running, it shows 20 in of vacuum with very little needle shake. From what I was told, it's a low mileage, stock motor that's never been apart. I pulled the drain plug and ran my finger around the inside of the pan and there was no sludge built up on the bottom.

Is there a way to tell if it's my rings as opposed to my valves?

Is there a way to check the lift on the intake and exhaust valves?

Anything else to check or try?

Thank you,
Joe