Old adage: pick a set of needs and go that way and balance that with associated cost and longevity. If the deck stacks towards a revving engine being more efficient, then short stroke is the answer. I have always been an advocate of superlarge bore short strokes. (1906 cc Vw engine) but I had the doors blown off my big bore harley by a long stroke chopper. Not much of a help here, but how long are you thinking of keeping it?
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