i get paranoid about the pistons sticking out the bottom of the cylinders too far when lifting them, but that's just me. up to 1mm higher hasn't given me any "too tight" belt tension issues, and if you can machine the valve reliefs and piston crowns a little you can get more comp by sticking the piston up higher negating the need for anything more special there.
748 pistons you can machine a bit off because they're so tall, 916 not so much. that sort of thing.
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