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-   -   underdrive pulleys? (https://67-72chevytrucks.com/vboard/showthread.php?t=376659)

timcrow00 12-16-2009 04:34 PM
underdrive pulleys?
 
has anyone used any underdrive pulleys? how much hp do you gain? how much did it affect the ac comp. , cooling, or charging?


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