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6.2 rods with a stock crank, hmmm interesting question, not even sure it could be done. For one, your wrist pins would be up in the ring lands , the 351 has a fairly good ratio in its stock form anyhow.
Also using 6.2 rods is not exactly better. The purpose of using a longer rods is for better angularity with stoker cranks, to keep from serious wear issues due to a low rod angularity. In theory longer rods have less wear on a motor. However going from 1.55 to 1.60 is probably not going to make any difference because anything around 1.52 or better is considered ok. Keep in mind going from 1.45 to 1.55 is more of a difference then 1.55 to 1.65. becuase the ratio only helps you to a point.
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