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At the moment, there are only aircooled versions available here through an airplane firm, maybe JE is still available with 97mm & 98mm, even 96mm is on the safe side with original cylinders. The same airplane firm produces a new series of cranks for a good amount, not too expensive, maybe in the 800,00 $ area with a lift of 82mm. You can run them together with the low compression pistons of the last build Busses -91, they have 8,5:1 and with 2,3l around 10,0:1, if you won't rework the combustion chamber.
There's enough possible, just tell me what you are exactly interested in.
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