Atlas 10-428 10/12" Motor Pulley Drawing

Yes the belt becomes wider inside as it gets more tightly wound.
Pierre
 
I went ahead and measured, using my compound and a dial indicator. I measured 33 deg for the large one, and about 34 for the small one, measuring off the unworn part. (included angle). I also found that the two flanges on the large pulley were not equal, with regards to angle. I cut both sides to 33 deg and on the small pulley, cut both sides to 34 deg. But yes, I was thinking the small pulley would be appreciably less angle than the large one.

I did the machining between centers using a tapered arbor:
 
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Apparently, the construction of the FHP belts is such that as the pulley diameter decreases, the V comes closer and closer to a rectangle, with the majority of the change occuring at the ID.
 
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