Serial number denotes this a turbocharged diesel engine. We purchased engine as is with naturally aspirated exhaust manifold and ran it as such. Test ran 2-10-18: Good running A- with 50-60 psi oil pressure. Starts and runs good low to high idle. Blue smoke at first start up but cleared up when throttled a couple times. Has a touch of blow-by and smokes a bit when throttled hard. See it run on video!!