1. It is Cummins 6BT engine main bearin 2. OEM number: 3901091 3. Competitive price with high quality and good servic Main BearingRemarks:1) We manage in auto engine valve, piston, piston ring, piston pin, cylinder liner, crankshaft, camshaft, cylinder head, cylinder block, connecting rod, main bearing, crankshaft bearing, connecting rod bearing, vribbed belt, belt tensioner, water pump, ...