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For a B Series motor you can do anything from 81mm-87mm. The pros are more power added with the larger displacement. The down side is the possibility of blowing a head gasket if you go to big and have tuning issues (detonation and such). I went with an 85mm bore and thats about i would go if your planning on throwing some boost at it (i plan to run near 30 psi with mine). To me this is a hell of a deal. YOu get the added strength, same r/s ratio because your only changing bore, and its fairly inexpensive due to the gains that you acheive with it.
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