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There isn't as much possible error in boxer motor cranks. You don't even need counterweights, as witnessed by the 911T. So you are only talking about a few grams rather than needing to re-grind counterweights after installing lighter rods and pistons as you would need to do on an inline engine, assuming it was balanced at the factory.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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