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Everybody...have you heard....if you're in the game...
 

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Psst... The 2.5L and 3L cranks have the same stroke.

The bore is where the difference in displacement comes from.

The only real difference in the cranks is the 3L crank has heavier counterweights to help offset the heavier reciprocating parts. This actually helps cut down on crank flex and adds to engine smoothness as well.
 
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