as Smokey Yunick used to say "when ever you build a motor stick the longest rod possible in it"
that said, there's big gains when you first start using longer rods, once the rod ratio falls within a certain range the gains are not as noticeable. your info is incorrect. a longer rod gives you more dwell time at TDC . during this time more pressure is built above the piston which gives more torque. if you hang a degree when on it you can see the extra degrees of dwell at TDC.
personally I don't think you would know the difference between the 2 . building a motor like you are and lack of a dyno it will be difficult to get the most out of it.
if its a 4000 rpm motor no pop out
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