Engine is ready to be fired for the first time. I bought a used AC delete pulley and he gave me a new belt with it. That belt is to small and mine is to big.

Mine I can slide right off after its on, the new one I can get about halfway on the balancer.

What can I do.....


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Mine is a 643k6, the one I got with the pulley is a 620k6


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take both to the parts house and find one in between.


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double check you are routing correct too.


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Just got a 630k6, its routed right.


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GM used two different pulley sizes for the a/c. So, depending on which one you originally had, the belt may or may not be the same as before. 642 and 635 belts were used.