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 - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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