The seals mearly prevent oil from running down the guides in quantity. Bothe styles do not reduce the iol flow to the point of additional wear. The umbrella style has been common on many engines, The teflon (more technically sophisticated style) , from the late 60s, has been used in most vehicles to control oil consumption while providing adequate guide lube.
There is nothing wrong with tight guides limiting oil flow, but!!! The engines were designed for heavy use in tillage and shaft/belt work running at 1/2 power or better all the time. today these tractors are utility light work and parade action runners that idle and run throttled down a lot. This increased vacuum draws more oil past the (probably worn but usable) guides. We are also using far more scientific oil and it has properties that lend it to getting into small places while keeping things much cleaner. They do not need seals to run well with tight guides. Seals will assist in postponing a head repair when there is life left in the valves. After a fresh rebuild, I would absolutely use teflon based seals on a older engine. Reduced fouling, reduced oil consumption, reduced polution, and better oil control on the stem reducing coking on intakes. I hope this makes my position understandable. JimN
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