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U/D crank belt?

This is a discussion on U/D crank belt? within the External Engine forums, part of the LSx Technical Help Section category; I'm currently running my LS1 without the a/c, so I got a belt that fits it without the A/C. But ...

  1. #1
    M3+LS1=Badass
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    U/D crank belt?

    I'm currently running my LS1 without the a/c, so I got a belt that fits it without the A/C. But I have an underdrive crank pulley that looks smaller in size than the stock one.

    Will I need to get a new belt? I honestly don't see how the belt that is on there will have any tension with the smaller diameter pulley

  2. #2
    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Grand Prix GTP
    2000 Trans Am WS6 M6

    Yes, you need a new belt. What percentage UD is the pulley...10% or 25%?

    For the 25% you will need the following two belts:

    Main Belt: #K060763
    AC Belt: #K040378

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