Got rid of those nasty mold parting panty lines and sand-rough as-cast surface on the alternator mount.
Skipped the mirror polish stage as 'utterly inappropriate' at this time, just like we all know that most chrome is Sick & Wrong on these cars. ( casting was a little porous too ...). But polished alloy looks great any where on a Porsche.
About 1 hour task not counting R&R; ~80 grit old flapdisc on an angle grinder to rough out, 320 paper on a DA orbital to tame those scratches, followed by a stack of those amazing 3M radial bristle discs in 220 grade on a die grinder (google images of 3M part 30128 - if you work heads or polish alloys you MUST become familiar with these radial discs !), then finished with a little 400 wet dry paper rub out happy ending to end a low maintenance matt finish.
I only did the exposed / top surfaces; since most of the alt /ac mount does not show, don't bother sanding the hidden areas. We wont tell.
I may mirror polish it when I get around to doing parts of the intake manifold.
I wish I'd polished the suspension cross member when it was out; looks pretty easy.
