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BBK under drive pulley

This is a discussion on BBK under drive pulley within the External Engine forums, part of the LSx Technical Help Section category; I've read a few things here, both pro and con, about underdrive pulleys. My friend has one and he'll sell ...

  1. #1
    Senior Member Too Fast's Avatar
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    Nov 2006

    2000 WS6 6spd Hooker LT

    BBK under drive pulley

    I've read a few things here, both pro and con, about underdrive pulleys. My friend has one and he'll sell it to me for $80. My car is a street driver, very limited track. Will I notice the small gain for the street? He said he noticed a big difference in rev speed when it was on his '99 'vette. I've seen here to expect ~8 HP gain, with some issues of running a bit hot at idle and maybe an alt issue if all accesories are on when I'm idling (FB jones).

    I also see ~10HP gain for an LS6 intake, which I'm currently looking for. I'm thinking for the small gain I'd have in the underdrive pulley (plus new belts) that'd it worth it.

    Any other opinions?

  2. #2
    Former Mopar Man 2002ssslp's Avatar
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    Jun 2011
    Branchville, NJ

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    02 Camaro SS, 04 GTO

    Not much gain from my point of view. It's all hype. You may see 2hp on a dyno and no real change with your accessories so I would not waste my time and money if I were you. JMHO
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  3. #3
    Super Moderator
    pajeff02's Avatar
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    Feb 2009
    Mansfield, PA

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    '02 WS.6 / '07 Suburban

    Agree. I guess if you are trying to eek out every last available erg of power, you'll save a few with an underdrive pulley. If you do choose to install it, be sure to purchase a new GM or aftermarket crank bolt.

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    Feb 2009
    Ugy Lower Corner of AL

    Navy Blue Metallic
    98 T/A w/a little mods...

    For the cost of UD's there is other power adders that produce much better output of HP.

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