Fits Detroit Diesel 6-71 Nat, 7.0L Engine Short Block Used 6 Cyl Diesel ESN: 6A234648 MDN: RA*6174N BCN: 5111434 SAE #2 Bell House Engine features from flywheel end of engine: Blower and starter mounts on the left, exhaust mounts on the right with right hand rotation. Bore/Stroke: 4.25x5.0 inches. Turns over nice. May need cylinder work. Has hole in oil pan. Selling as is. Over haul kits available.