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Under drive pulley?

This is a discussion on Under drive pulley? within the External Engine forums, part of the LSx Technical Help Section category; In the market for an under drive pulley, any suggestions on brand and part number, and it takes the place ...

  1. #1
    Member Edward-T's Avatar
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    Under drive pulley?

    In the market for an under drive pulley, any suggestions on brand and part number, and it takes the place of the harmonic balancer, correct?
    2011 GS

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    2000 Trans Am WS6 M6

    ATI is on top of the market, but $500+ for a crank pulley is kind of steep for most people.

    The most common dampener out there is the SLP/Powerbond 25% Underdrive Crank Pulley.

    Don't forget that you'll need shorter belts for both your accesories and your A/C. Here are the part numbers:

    Acessories: #K060763
    A/C: #K040378

    You'll also need a new crank pulley bolt, since the stock one is torque to yield and is non-reusable...I would suggest investing in an ARP Crank Bolt.

  3. #3
    The Generals Finest Deviant LS1's Avatar
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    The SLP/Powerbond are only a couple pounds lighter than stock but do they have a larger lip for better belt retention.

    I had an ASP 25% under drive pulley on my last car. Good fit, never threw a belt and it weighs almost half as much as the factory pulley.

  4. #4
    Veteran 0rion's Avatar
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    another vote here for the powerbond pulley

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    Member Edward-T's Avatar
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    thanks guys, is there a website that sells them? like Hawks, Summit, WS6 Store?

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    Veteran 0rion's Avatar
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    Senior Member cpop98ws6's Avatar
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    I have an ASP on my car, no problems with it at all.
    Callies 383, Trick Flow 225, Rapid Motorsports Dominatior 2 X cam, ls6 ported oil pump,42lb injectors, FAST 92/92 , ASP underdrive pully, eletric water pump, Pacesetter LT's, Pacesetter ORY, Magnaflow catback, e-cutout, Yank SS 3600, Performabuilt stage 2 4l60e, Strange S60 ,4.10s, Detroit Truetrac, (UMI) - Adj. LCA, Adj. tunnel mount torque arm, Adj. panhard bar, Drag bar, subframe conectors, shock tower brace. 465rwhp-438rwtq 11.09@119.90.

  8. #8
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    I bought an ASP pulley over ten years ago and never installed it on the LS1 that was in my car. This past summer I installed an LS6 in my car. The ASP pulley was installed on that engine along with an ARP crank bolt. I have ~6000 miles on my car since the install and it's working great. I've heard there may be charging problems when using AC when you have an underdrive pulley. I never reinstalled my AC system and it's not a problem for me. I always see over 13 volts on the gauge.

  9. #9
    Member Edward-T's Avatar
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    not a problem for me....the A/C is going to be deleted.

  10. #10
    Drop&Drag matt evans's Avatar
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    a/c is over rated if you have t-tops

  11. #11
    Senior Member cpop98ws6's Avatar
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    Yep no A/C here either.

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    Veteran 0rion's Avatar
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    I have an underdrive on mine with a/c......a/c hasn't been turned on in 4 years but neither have the windshield wipers.

  13. #13
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by 0rion View Post
    I have an underdrive on mine with a/c......a/c hasn't been turned on in 4 years but neither have the windshield wipers.

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