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Go look at an engine assembly; CHANGING ROD LENGTH WILL NOT CHANGE YOUR STROKE. You'll need a new crankshaft to change your stroke length and swept volume. I haven't looked at the dynamics in a long time but you may get a change in compression ratio and the details that Aetyrno went into seem to have some validity.
The only reason to upgrade/change your rods are if you have a new crank and need a new rod to make sure your piston is in the right place as well as stronger rods if your engine is putting out more torque due to other mawds.
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