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B eries engines are like Legos. You can take any crank you want and stick it in any block you want. Since the bore size in all of them (B20 excluded) is 81mm, you end up with the displacement of the engine the crank came from.
Crower, Jun, and Toda all make stroker kits for B series engines. Machine work is virtually non-existent. Boring can be done up to 84mm, 86mm if sleeved, depending on who you talk to.
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