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2. It has a turbo with ROTO-MASTER cast on the housing. Does that clue ring a bell with anyone? It also has a "Dyno-Tune" sticker on the air cleaner housing but that company seems to have disappeared ~25 years ago according to Uncle Google. He kept a paper file on the truck including the ad clipping how he found it which stated "new 6.2 turbo, trans. and transfer case." What exactly "new" really meant is anybody's guess. Could that turbo be a later 6.5 parts mod since factory 6.2 was NA only? What casting marks can I find to confirm which block is really under the hood? 4. I've read online that harmonic balancer rot was a problem with these 6.2 Detroit Diesels that if not fixed could cause web cracks and/or broken crankshaft.
1984 Factory Service Manual1984 Factory Wiring ManualThe 6.2 Liter Diesel EngineChevrolet Diesel Fuel Systems