My previous post piqued Dick Hollingsworth's interest and he did some research and came up with what seems to be a definitive answer to my question: How did George Roeder go 20mph faster in '65 than Roger Reiman in '64 in the same streamliner. The answer is better salt conditions AND more power.
Scrolling down quite a ways is a heading "Sprint CR Publication & Information" and immediately following is an article on the '64 effort with Reiman, with this photo:
This clearly was a wet clutch motor which normally would be long stroke. I suppose it's theoretically possible that it had a special short stroke crankshaft and top end, as Mick Walker claims in his books 'Classic American Racing Motorcycles' (1992) and 'Aermacchi' (1995), but I doubt it. Scrolling down further is the article on the '65 effort with Roeder. Neither of these articles are identified as to what publication they came from, but I suspect both are from H-D's in house publication "The Enthusiast".
Great stuff Dave!
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