P circle seals have a teflon ring riding on the stem, and it is free to move within a small chamber in the rubber part of the seal. this short stroking action meters oil into the guide. They can be put on almost any engine. The ones with cast in place valve guide bosses must be machined to take the rubber part of the seal. Most with pressed in guides do not need any machining. JimN
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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