I talked to the extremely helpful people over at Hayes Rotary about putting NA rotors into my 13BREW. The need for balancing of the new rotors came up and they said they would send it out and have the rotors balanced to within a gram of each other, which is better than what the factory does, evidently. The only other thing besides porting is making sure that the ports match the intake manifold, smooth them out and the insides of the intake runners. I've heard that the manifolds can extrusion honed smooth.

Brian Trubee

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