SLP's New 25% Underdrive Pulley / Harmonic Balancer for LS1 GTOs 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 endemic to other LS1 balancers. 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: Requires 2 new belts (Dayco # 760K6 and # 405K4 or equivalent, not included). For GTOs only.
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
SLP Performance Harmonic Balancer/Under- drive Pulley 2004-06 GTO 100226 25 Percent Underdrive Harmonic Balancer/Pulley Steel Black Pontiac 2004-06 GTO 5.7/6.0L Pit Stop USAoffers SLP Performance Harmonic Balancer/Under- drive Pulley 2004-06 GTO 100226 at low everyday prices. Be sure to check out all of our products from SLP Performance including SLP Performance Harmonic Balancers - GM LS.