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The smaller dia crank pulleys will also slow down the water pump, alternator and A/C compressor(if equipped). If it is a DD I wouldnt opt for the PRC pulley from the typeR/Z3 engines, the PRB(A2) crank pulley is small enough.
 

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The K20A3 in the EP3 has the same crank pulley damper as the K24's, it is more RPM related rather than displacement related.

The K20A has a higher rev limit from the factory along with the higher FD(more revs at any MPH). This prevents the coolant pump from cavitation/aeration of the coolant at high rpm's. If you are going to spin the K24 up rather high(still below k20 revs) then go with the A2 damper. The Honda dampers do not have any balancing properties, but are used to dampen the harmonics as mentioned above.

My A2/Z3 runs a bit warmer than the A3 did at lower RPM's, but as soon as you get the rev's up the temps drop.
 
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