I'm going with the cracked pick up tube. Even if the top drain holes were clogged, I don't think it could pump all the oil up top in 45 seconds! If it were that clogged it would be sucking oil up the PCV and blowing oil in the breather box.
Thinking the crack is just below the "engine off" fill level. When the engine starts the level drops below the crack, the pump gets a mix of air and oil, pressure drops, lifters get full of air. Possibly the engine hasn't been hurt yet since it does build pressure temporarily, assuming there is no bottom end knock.
Even if the pick up screen were clogged, every one I ever looked at had a bypass feature that would open and let oil flow to the pump. Problem is, the oil going through the bypass can contain large, hard chunks that can lock the pump, twist the shaft, then no oil at all.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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