Valve guides--usually intake guides--leak oil into the combustion chamber, where it's burned, and then exits via the exhaust. Intake guide leaks usually are more noticeable under high vacuum conditions. Exhaust valve guides leaking oil are seldom major smoking problem, but they may coat the exhaust manifold with oil if they're severe enough.
When you have oil smoke in the breather, think about how it got there in the crankcase...it could ONLY be the rings, providing nothing's cracked.
Get a leakdown tester, and perform a leakdown test. While oil smoke on startup ONLY [or on deceleration/high vacuum conditions] is usually a sign of valve guides, constant smoking out the breather can ONLY be caused by bad rings. You may unstick 'em with ATF, or you may have to bite the bullet and tear it down.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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