The metal plating on the pulley and the fan, let me guess... silver zinc?? I ask this because they look nice, but I have always noticed the extra shiney look of zinc vs cadmium... GM still used Cadmium until late,late 72 into 73 when the EPA issued one of their 1st orders which effectively banned cadmium's widespread plating use to only use by aeronautical plating.. Your alternator looks great.. Someone asked about open face vs closed face.. The 928/927 series were used on many cars. I have seen some with open face anmd some without.. My guess is the "performance" cars got the open face and the non performance cars got the closed face.
Also, FWIW... the original alternator fans were galvanized zinc plated, not zinc or cadmium.. I have tried 6 different galvanized platers and none can make the fans work, all of the turns/bends make the zinc( that is what galvanizing is) clump up. Originally these were stamped out of sheets of galvanized metal. Ever seen the metal poles in the electrical dept. of home depo? the galvanized poles with the small discolored irregular shapes? yes, that is what the original fans were plated with. I have 2 original ,NOS in the box fans and they have this finish. Plus, every original fan I have taken off an altenator, under the pully ,in the protected area, still have remenants of this galvanizing.. The dullness of white cadmium, comes as close to the original as you will get..
NJsteve....I have a stack of original alternator fans that I have had done this way. If you want to swap out your fan for one of the ones I have( it will look more original), just let me know.. I will be glad to send you one and if you like it, send me back your original..
Just my thoughts on alternator fans and pulleys.. Plus... the nuts should be cadmium also...Steve, I have some already plated also you can have.,..
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