I’m rebuilding the bottom end on my 07 W4500 / NPR-HD 4HK1-TC. The shop manual I’m working off of states that the Cylinder block bore grades are stamped on the block above the oil cooler and should be a 1, 2 or 3. There are 4 nice flat spots where stamps could be, but aren’t. there is a stamp on top of the block, where the head gasket sits thats “BBCC”. What am I missing? Any help would be appreciated.
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