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the best way is get the #'s off the drivers side front of the engine

NHC 250 Doesnt have piston coolers so if you push it too far (fuel wise) it will score a piston. 270,290,300,335,350 etc have oil squirters that spray cooling oil on the bottom of the piston. you can turbo a 250 but the compression, timing, fuel timing ,cam etc is all different. Cummins...