Hi Georges, 9.7 CR rotors weigh 9.54 lbs and 9.4 CR rotors weigh 10.1 lbs.
-- Ian

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Group
How do you tell which rotor is 9.7:1? I took an '86 withe EGR valve on the
center plate apart and found perfect rotors with an "S" stamped on the
side, they look identical to my 91 NA rotors who have a "S" on them as
well?
Georges B.