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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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