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I don,t do any aluminum rod engines but the parting line will be bigger. Do to the weight of the piston stretching the rod, at max piston speed the big end will be round.On a steel rod engine you will see about .0015 to .002 big at the parting line.The bearing it self has built in eccentric/tapper to help combat the bearing pinching the crank.

I would check the rod big end to see if it is in spec.

A (p) bearing will have a diffrent eccentric then a (z) bearing.
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