jatonka
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Chiming in with maybe useless informatrion here, but I'm going to try to help those who will listen. Cummins 855 engines, also known as NHC 250, and others, do NOT turn over 2100 RPMs and live long. Ask any real Cummins mechanic, don't trust me. Of course, I've been around Cummins and owned them since 1969 and haven't ruined one yet. But I'm not a Cummins mechanic. Leave the motor alone, add more gears. plain sense. JT out