DD four strokes: 8.2, series 50, series 60.
DD two strokes: Anything 53, 71, 92, 110, 149. Those numbers are the cubic inch per cylinder, and came in lots of cylinder counts. Some in-line, some vee block.
For example, a 71 could be 1, 2, 3, 4 and 6cyl inline. And 6, 8, 12, 16 and 24 cyl vee block.
6-71 inline
6V-71 vee block
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