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For me anyway, the main idea is to do it with what's there and not spend lots of money. Integral with that is the reversability of it.
If within that engine family there exists a short stroke crank and other bits that more or less drop in the cost hit isn't necessarily that bad but still unlikely to pay back.
I think an engine swap to a purpose built twin or whatever has fewer compromises and greater chances for fe gain success but then one is looking at fabricating a bunch of custom stuff again.
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