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I redid my 32 Standard 8 engine with better compression numbers than yours. I suggest you pull the head and do a proper inspection of this engine. This will also give you the opportunity to mic the cylinder walls for out of round which is common. Marvel Mystery Oil is not the savior of theses engines and the oil is unlikely going to get the valves unstuck as most of it will go down the cylinders. Any attempt to start the car could result in a hydraulic lock up if all the oil is not out of the cylinders before you crank it. A routine valve job is in order here and was a very common repair at 50,000 miles back in the day. Packard engines run beautifully when in proper specs. This engine should have 85 lbs of compression across all cylinders as mine now does and it starts easily and idles smoothly something that I am sure you want in the end.

Good morning.I agree with Gary. The cause may actually be that the car was not driven regularly. You do need to remove the head and valve covers and inspect. Another problem we see. Over and over is starting these engines with old fuel. They sometimes do start, but leave varnish everywhere, and when it cools and hardens, the engine becomes stuck. You need to do this work correctly. Attempting to save money usually means you will pay twice, unfortunately. Good luck. Ernie in Arizona

Static compression is cranking compression. Dynamic compression is with the engine idling, which always is lower, unless those labels are wrong of course.

The variation isn't so hot either and I would expect that should be fixed as it is poor enough to affect idle quality and cause overheating.

Freeing up the valves can be done with the valve cover off and a pair of water pump pliers if you are lucky, but only is a temporary fix. Running Gumout through the thing might help a little.

The least expensive route is pull the head, take out each valve, and polish the stems with crocus cloth or whatever. Clean the guides out, clean the oil pan, crankcase, and start running Risolone with detergent oil.

I hadn't noticed the "Dynamic Compression" label, and I'd assumed it was typical static compression test results. Thanks for pointing out the difference. Yes, I think I'm going to have to pull the head and valves.

Looks like a valve in each of cylinders 4 and 6 is stuck open- can't visualize cylinder 2 in the photos I took, but compression test readings in 2,4 and 6 cylinders were zero dry and wet. Exhaust or intake valve?

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Lots of WD-40 and PB Blaster with some gentle tapping of the top of the valve through the spark plug hole freed up stuck exhaust valve in cylinder 6. I'm soaking the remaining exhaust valves (2 and 4) and hopefully will free them up as well. Fingers crossed!

Great news. Since you can get to the valve ends you could try rotating the valve with some pliers. Just another thought

Good idea- thanks!