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Originally Posted by Morley
Ummmm...Why? Its the little "o" ring seals on the valve stems that are leaking. With age and heat they get hard and shrink away from the stem and eventually break apart, letting oil down into the cylinders.
And there are no guides to remove from a stock head, they are just a machined hole for the valve stem...You can either have them knurled or have the hole bored out and a phosphor-bronze guide frozen and pressed in, then honed to final size...IF the iron guides give out...in about 1,000,000 miles or so.
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oh... my bad. im not suprised that i was wrong considerring my source. but that is what i was told. but i believe morley knows a thing or 2 more than me. lol.