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If you are planning to change the bolts to ARP you should probably have the rods rebuilt/resized with the new bolts as the new bolt clamping force can change the diameter/shape of big end. I have measured both stretch and torque while tightening rod bolts. I have found that the torque required for the correct stretch to be pretty consistent. I think you could bolt the rods down on the bench to see the required torque for appropriate stretch and then use the torque value when the rods are put back on the crank.
john
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