They do not have factory stem seals. I always rebuild with PC style teflon slider oil control seals. Umbrella seals (though less directly effective) work well, and can be installed without removing the head. (use a piece of clothes line cotton rope in the cylinder to keep the valves up while removing the springs and retainers, to allow stem access. Using 30 wt oil as recommended from the factory back then, allowed less seepage down the stem than modern multi Vis, (do not go back to single wt oil, no need). I would give that a try, it is cheap and easy. I would also say that it could have a crack in the intake side of the intake ports allowing oil into a cylinder, but it would sure show on a plug reading to be only one cylinder. Jim
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