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Well that is two fold... The obvious reason is the added displacement. But the downside is the rod/stroke ratio with stock rods and longer stroke. The motor wasnt made to be a high reving motor so the r/s ratio was geared towards more torque. I wouldnt use a 3s crank in a 5s block because that would defeat the purpose going with a 5s block. I would infact use a 5s crank in a 3s block and that would net a displacement increase of ~.1L and would allow the use of the 3s rods with some work, and would net a better R/S ratio and allow for better revving of the motor. The main benifit of going with the 5s block is the 2.2L of displacement.
-J
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