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Exactly correct. I acted as two bolted V-6, but was a true single cast block. If it were two bolted sixes, I'd have saved a lot of work trying to pull engines from PD4901 chassis!

I worked on 'cruisers (PD4501)! They originally had (2) engines (3-71) that were connected through a hydro unit to drive the tranny. 'hound had a major retrofit and replaced that rube goldberg setup with a single 8V-71. There was one bus with a 12V-71 that was the last GM motorcoach made for...

They DID catch on. Detroit made 2-71, 3-71, 4-71, 6-71 and 12-71. That design persisted for close to 50 years! All greyhound (and most other) buses used detroits until those crap Eurobuses arrived. I was putting 3-71 into F-150 pickups for servicing the oil sites in southern Cali. The...

The 12V-71 is much larger than a straight 6 diesel - Herc or Cummins. It is also much, much heavier. It has TWO superchargers that are necessary for it to run. The Detroits are 2-cycle diesels as compared to the 4-cycle Hercs, Cummins and Cats. In addition to doing alot of work to get it to...