"I got good compression . eliminating possible rings."
NOT necessarily.
The OIL CONTROL RINGS have VERY LITTLE to do with compression. There's 2 rings above 'em that seal against compression. The oil rings act as "scrapers" pulling the oil downward (or "INWARD" with your flat twin).
That flat-head twin with the "valve boxes" on top is FAR more likely to be pumping oil past the rings than pulling it in by the intake valves as the valveboxes are in a relatively oil-free area compared to the valves on an OHV engine where the whole valvespring/valvestem area is DRENCHED with oil.
In other words, you can have an engine with good compression and bad/broken oil control rings and it will burn oil.
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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