If it eases your mind any the 6.2 and 6.5 GM diesels are NOT Detroit Diesels.
You can blame GM directly for them and leave Detroit out of it.

I've got a whole bunch of Detroit Diesel literature, manuals, spec sheets, advertisements, data books.. and so on, a few shelves on the book case full. And not once in all of that is a 6.2 or a 6.5 General Motors diesel mentioned.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-