Haven't a clue myself but one thing that might help is if you can get
your hands on the illustrated parts breakdowns and lists and then
compare. That will tell you if the major engine components are
different or not.

On Jan 24, 5:43 pm, "mark" wrote:
I have a new cummins 6bt 5.9 210hp and I regret not getting the 260 or
315hp versions. Is it feasible to upgrade the 210 to a 260 or 315.
Other than an after cooler what else is different? Would it be easier,
cheaper just to replace the engine.