Difference in Crank Pulleys Question

JDMMA70

Active Member
Dec 4, 2006
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Houston
I tried searching and could not find an answer to this question. I have two pulleys both came off of 7M-GTE's but they look quite different. I was wondering what the differences are and if there are any pros and cons to each of them if any at all.

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Thanks for your time again i hope this isnt a repost...
~JDMMA70