Squeeeeeeeeeeeeeeeeeeeeelll

"B" belts are 5/8" wide nominal.

"A" belts are 1/2" wide nominal. Most GM alt pulleys are gonna take the "A" size. Like George says, nothin' wrong with "B" belts. DD
 
I would think the OP is using the wide belt alt pulley for GM from Speedway or elsewhere. As said earlier, use a cog belt for the smaller pulley.
 
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