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You can go all the way to 3.7L using your 3.0L case as a starting point. I've talked about this in the past.
To get this maximum displacement from a 3.0L starting point, you would use Mahle 102mm pistons/cylinders with a Carrera 3.2L crank (74.4mm stroke) with an aftermarket rod such as Carillo or Pauter.
The case spigots would have to be bored from the stock 103mm all the way to 107mm, which makes it quite thin.
Andial sells the necessary components for this conversion, but sit down when they tell you the price, it is not cheap. For this kind of money, the 3.6L transplant becomes more attractive. You would also have to figure in the additional cost of twin-plugging and the necessary machine work for a successful 3.7L motor.
It has been done, but may not be the most cost effective or reliable option available today.
Ralph
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