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Old 10-07-2015, 11:15 AM   #119
slikside
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Join Date: Jun 2010
Location: San Diego Co.
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Re: Out of the Ditch = The Rebuild Begins ('72 GMC)

I would say that rotor is more than likely original. That groove corresponds to the minimum thickness required, which is stamped onto the hub there somewhere. These rotors may have been available as NOS or something for a while, but long ago they went to a flat surface with no groove. All my recollection, anyway...could be wrong.
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, all stock, Survivor.
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