I would start by checking the out flow of the pump. Into a can or a clear line on the pump. Watch it while running. Those vacuum pumps tend to fail after a few years. Lets air into the system.
Check the valve settings cold page 2-1.
This is the hard one. Rotate the engine until the valve is off the seat.See if the seat shows any signs of being loose.
Check the intake manifold for leaks. This was a known problem on some units. Not sealed properly at the factory. Some units took years to show up.
What brand of spark plugs.
I will check my notes. For any odd problems I ran into over the years.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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