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A lot of performance cars did use vented drums. A lot of bikes did too.
I did not chech before and after weight. I would guess the difference to be less than a pound.
As for wear, I have seen brakes with thousands of miles on them that still look like new. The key is to sweep the entire shoe/pad.
I am going out right now to put them on the truck. I will post the results.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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