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12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9 in Kuwait 12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9 in Kuwait 12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9 in Kuwait 12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9 in Kuwait 12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9 in Kuwait 12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9 in Kuwait 12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9 in Kuwait

12557840 Harmonic Balancer Bolt Performance Parts 12557840 10.9 Grade Upgrade for GM Gen3/4 LS Engines (LS1/2/3/6 LQ4/9) 4.8L-6.2L - Replaces 917-139, Excludes LS7/LS9

KWD 4.500
Brand
LaWana
– 1 +

Special Features

  • Precision Fit for GM LS Engines:LaWana 12557840 harmonic balancer bolt directly replaces OEM part, for Gen3/4 LS engines (LS1/LS3/LS6/LQ4/LQ9 & 4.8L-6.2L). Guaranteed compatibility with 30+ variants including LY5/LM7/L96,Excludes LS7 and LS9 models for clear compatibility
  • Maintenance and renovation harmonic balancer bolt:10.9-grade high-tensile Replace aging bolts or repair crankshaft damage caused by harmonic balancer failure. Install basic fasteners for the new harmonic balancer (such as lightweight retrofit parts
  • Critical Repair/Maintenance Solution:Stop crank seal leaks & harmonic balancer wobble! Essential replacement for worn OE bolts
  • Performance Build-Ready Upgrade:Mandatory for LS engine rebuilds/forced induction builds. Secures aftermarket harmonic balancers
  • OEM Compatibility & Trusted Performance:Designed with OEM part numbers 12557840 and 917-139, for precise fit and optimal performance in GM harmonic balancer systems

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