Well, technically yes. If a valve is stuck open because of no rocker clearance, then there be no compression because of no air tight cylinder.
But, .... say the cylinder will fire at 70 psi compression. But not at 45 psi. And yours is at 55. Enough for the cylinder to fire SOME with an un-fouled bran new spark plug. But not, once fouled by wet gas because of not firing all the time because of inadequate compression. Then the dead cylinder never fires, because of not only bad compression, but also a fouled plug. At this point, there still should not be any leakage at plug threads NO MATTER what the compression is. The leakage only indicates one thing. That it should not have any leakage. And leakage can only be coming from bad threads in the head, or on the plug. Being a new plug, unlikely to be bad threads on a new plug.
For what it's worth, it shouldn't be doing that. And I'd wager a bet, that your other cylinders WOULD NOT do that if you ran the tractor with the plug wire completely off of any one of them you were doing the test to. And if they somehow ironically all did the same thing, then obviously someone has put in an entire set of the wrong plugs at some point. Shouldn't be no leakage. Leakage indicates bad threads or wrong plug, no matter how you slice it.
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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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