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      04-08-2013, 06:17 AM   #3
Soorena
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Bore wise, there is not much to do. The stock cylinder wall thickness is just 6mm, so you can only bore-out the engine by 1-2mm.
As for the stroke iirc it can goes up to 85mm. I heard that from a BMW mechanic (I don't recall if it's because of deck height limit or crank room limit). So 4.7 would be the biggest displacement.