You need to know your stroke, piston weight, pin weight, lock weight, and ring weight. With this info call Oliver and see what they recommend. We have run as high as 9000rpm with the 4.250 stroke crank. We were using aluminum rods though. Remember that at 8200 your piston speed will be just over 5800fps. Make sure you have a good vacuum on the crankcase to keep the rings sealed.
Jay
422motorsports.com
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