Feature: 1. Applicable Model: The 25% underdrive balancer pulley kit is a replacement for Commodore VT VX VY VZ V8, for HSV LS1 LS2 L76 L98. 2. High Performance: Complete kit including balancer, 4 pulleys and 2 belts, no tuning required, bolt on power and performance up to 10‑15 hp, heavy duty high speed bearings for better performance. 3. Increased Horsepower: Underdrive kit produces more horsepower by reducing parasitic power loss from driving engine accessories including alternator, power steering and air conditioning. 4. Certification Compliance: All Series balancers feature a keyway slot meets SFI Race certification 18.1. If being used for street use alone you can easily silicon it shut with no hassle. 5. Faster Engine Acceleration: The smaller diameter harmonic balancer reduces inertia, leading to faster engine acceleration and improved throttle response. Specification: .Item Type: Underdrive Balancer Pulley Belts KitMaterial: Metal, ABSFitment:Fits for Commodore VT VX VY VZ V8 Fits for HSV LS1 LS2 L76 L98 Package List: 1 x PBU1480SS25 Underdrive Harmonic Balancer1 x EP024 Nuline Idler Tensioner2 x EP025 Nuline Idler Tensioner1 x EP026 Nuline Idler Tensioner1 x 4PK Drive Belt1 x 6PK Drive Belt5 x Gasket1 x Screw