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have been watching the u tube videos with the guy in Austrailia rebuilding his 100-6. at one point he is showing his pistons and there is a +7 stamped on his connecting rod. i think he said all of his rods had that but that he had standard size bearings. he did not seem to know what the +7 meant. is that a weight measurment they used at the factory for balancing? or does the number mean something else?