Evidently the B10 and B50 numbers are estimates of engine life provided by the manufacturer. They are based on the engine design (distance of piston travel per mile and other inherent factors). Whether or not the "B" numbers hold up when hundreds of thousands of engines are on the road is another story. I read that Ford assigned a similar B50 number to the 6.0 as they had on the 7.3. The only problem with their engine life estimate was that few if any 6.0's will ever make it to the B50 mileage due to fuel system and other problems. Many 7.3's actually reached the estimated engine life, because the fuel system and the rest of the engine were decent.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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