SLP 97-04 LS1/LS6 Harmonic Balancer/Underdrive Pulley

SLP 97-04 LS1/LS6 Harmonic Balancer/Underdrive Pulley. SLPs new 25% underdrive balancer for LS1/LS6/LS2/LS3 Corvettes incorporates a number of high-quality features you wont 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 (see photo). Gains of up to 10 horsepower can be expected. Other unique design strengths include 100% steel construc tion (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 new serpentine belt (Dayco #5060780 or equivalent not included). FEATURES: Extra-tall belt-retention "walls"--no more thrown belts! No aftermarket tensioner required 100% steel construction Lighter than the stock balancer 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