LS1/LS6/LS2/LS3 Harmonic Balancer/Underdrive Pulley

Free Shipping Price: $219.95 (USD)
Part #: 100225
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SLP's 25% Harmonic Balancer / Underdrive Pulley for the LS1/LS6/LS2/LS3 Corvette and 2008-2009 LS6 Pontiac G8 and 2009 GXP incorporates a number of high-quality features you won't find on any other aftermarket unit. Chief among them are a pair of extra-tall belt-retention walls that eliminate the belt-slippage issues common to other balancers. Gains of up to 10 horsepower can be expected. Other unique design strengths include 100% steel construction (other brands use steel and aluminum), integral timing marks, and built-in puller-mounting threads. Includes a new balancer bolt and detailed installation instructions.

NOTE: Balancer requires two new belts not included.

1997-2013 C5/C6 Corvette
Main Belt: Gates 6PK1900 or Equivalent
Accessory Belt: Gates 4PK1040 or Equivalent

2008-2009 Pontiac G8/GXP
Main Belt: 6PK1860 or Equivalent
Accessory Belt: 4PK1050 or Equivalent

  • Extra-tall belt-retention "walls"-no more thrown belts!
  • No aftermarket tensioner required
  • 100% steel construction
  • Integral timing marks and puller-mounting threads
  • Keyed for high-rpm or supercharged applications
  • Does not cause false knock retard or erratic power-curve dips
  • Includes a new balancer bolt
  • SFI Approved

  • 1997-2013 Corvette
  • 2008-2009 G8 GT/GXP
  • Corvette LS1, LS6, LS2, LS3 - 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013,
  • G8 GT/GXP - 2008, 2009
  • Tools: Shop Tools
  • Install Difficulty: Expert

SLP 100225 Underdrive Pulley/Harmonic Balancer Instructions