It's hard to get a valve stuck open on each cylinder as only two of the fours strokes need an open valve. Kinda like havin' nothin' for rings on all four at once.
There's somethin' else goin' on there. I'm kindsa suspecting he could also have a jumped/stripped out/gaptoothed cam gear or that it got reassembled without timing up the cam gear correctly. Who knows, maybe he's hydrolocked and cracked the pistons by crankin' on em when they're full of oil. (jk)
He won't have to crank too many cylinders full of oil through to fill up either the exhaust or the intake side of the head, depending which valves, if any are stuck. If he is pumpin' the oil up into the head, I believe I'd be gettin the manifold or at the least the carb off of it. Pump enough in there and it'll be bubblin' over the top of the exhaust or startin' to fill up the air cleaner or both!
Brad! What if any work has been done on the tractor lately?
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