LS1 GTO 8 Rib Drive Conversion Kit with 10% Overdrive Balancer

LS1 GTO 8-Rib Drive Conversion Kit with 10% Overdrive Damper #989

$1,200.00 – $1,240.00

8 Rib Drive Conversion Kit with 10% Overdrive SFI 18.1 Damper for GTO.

Cars equipped with a sprag style alternator pulley will need to purchase PN#1053 LS GTO 17mm x 1.5 nut for the alternator pulley.

  • NOTE: The Super Duty Blower Hub option is a thicker hub that provides greater resistance to hub cracking under high power supercharged applications (750 rwhp and greater). This option includes a new custom made timing cover seal to adapt the oversized hub to a stock timing cover.


  • NOTE: The Underdrive Alternator option is a larger diameter alternator pulley (2.800″) that is designed to slow the alternator down when ran on high rpm race engines (7500 rpm or higher). The underdrive alternator pulley will slow the alternator down and may cause charging issues at idle for street driven vehicles.

    • Options

    967 Crank Pin Kit for LS1/2 GTO & LS1 F-Body

    Crankshaft Pin Kit for LS1, LS2 GTO F-Body #967

    Crankshaft Pin Kit for LS1/2 GTO & LS1 F-Body.

    Designed for use with Innovators West dampers. Will not work with OEM or other aftermarket dampers.

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    Kit Contents

    Qty PN Description
    1 833 8-Rib Drive – 10% Overdrive Damper
    1 979 LS Truck 8-Rib P/S Pulley
    1 1010 GM 8-Rib Smooth Idler Pulley – Offset
    1 973 GM 8-Rib Ribbed Tensioner Pulley
    1 1031 8-Rib GM Alternator Pulley or 1089 Underdrive 8-Rib Alternator Pulley

    Any additional aftermarket pulleys must be sourced from the manufacturer of those pulleys. Includes SFI 18.1 Harmonic Damper.

    GM LSX Motors [PDF Format].
    GM LSX 8-Rib & 10-Rib Drive Conversion Kit Install Instructions [PDF Format].
    Damper Hub Honing Instructions [PDF Format].