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'95 Ultra with 91,000mi, started smoking badly but still runs very strong. Did complete top end with new cylinders, valves, guides, gapless rings. Upon start up ran clean, but in about 30mi started smoking. Compression F-150, R-180. removed front head and oil in chamber. timing breather cks ok. Any ideas?
 

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You've probably already considered these, but just in case, here's my $.02 worth . At first blush, I'd suspect the intake valve guide has an unusually large clearance between it and the valve stem. Secondly, I'd suspect the valve stem seals. And finally, pull the cylinder and check for a broken ring.

Good luck,
 
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