pulley measurements

SC95Stang

Registered User
I purchased a pulley from a local guy, only problem is he wasn't sure on the size. How do I tell if its a 5 or 10%? There are no markings.
 
I purchased a pulley from a local guy, only problem is he wasn't sure on the size. How do I tell if its a 5 or 10%? There are no markings.

Measure with a caliper to the top of the ribs:

94/95 3.250
89/93 3.135
5% 2.950
10% 2.850
 
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