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SLP/Powerbond Underdrive Pulley balanced by drilling holes?

This is a discussion on SLP/Powerbond Underdrive Pulley balanced by drilling holes? within the External Engine forums, part of the LSx Technical Help Section category; I purchased a used SLP Underdrive pulley for my LS1 and noticed it has holes drilled into the back side ...

  1. #1
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    1999 TransAm

    SLP/Powerbond Underdrive Pulley balanced by drilling holes?

    I purchased a used SLP Underdrive pulley for my LS1 and noticed it has holes drilled into the back side that I understand is possibly for balancing. It looks pretty crude to me (no finish, uneven holes, etc) and I have a hard time believing the factory would ship it out like this but the seller claims it came this way from SLP. I was wondering if this is normal for an SLP pulley that is supposed to be neutrally balanced for an internal balanced engine.


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    Pewter & Mystic Teal!
    2002 CAMARO SS & 1999 TA

    im gonna say no...but call slp and ask em

    bone stock 2002 m6 12.9 @ 108 woooohoooo!!!!!!
    bone stock 1999 m6 TA 13.4 @ 104 2.1 60' Still has a little more in her!

  3. #3
    Just me Y2KPewterSS's Avatar
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    Pewter metallic
    2000 Camaro SS

    I am going to say no also.

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    Black
    2001 Camaro Z28

    thats messed up they didnt even bother center drilling the holes so they are ovaled and look terrible. looks like a failed attempt to lighten the pulley with a drill press . . .

  5. #5
    Knight of Chaos xzaero0's Avatar
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    Black
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    Mine didnt come with those.

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