High-Performance Harmonic Balancer Bolt: This 12557840 harmonic balancer bolt is a 10.9-grade performance upgrade specifically designed for GM LS engines. It provides enhanced strength and reliability compared to the standard bolt, ensuring optimal performance and durability.
Compatible with Multiple GM LS Engine Models: This bolt is compatible with a wide range of GM LS engines, including LS1, LS2, LS3, LS6, LQ4, and LQ9, as well as 4.8L, 5.3L, 6.0L, and 6.2L engines. It replaces the original part number 917-139, making it a perfect upgrade for your engine.
Excludes LS7 and LS9 Engines: Please note that this bolt is not compatible with LS7 or LS9 engines. It is specifically designed for the other GM LS engine variants listed above, ensuring a precise fit and optimal performance.
Enhanced Durability and Strength: Made from high-quality materials, this 10.9-grade bolt offers superior strength and durability. It is designed to withstand the demands of high-performance engines, providing a reliable and long-lasting solution.
Easy Installation and OEM Replacement: This harmonic balancer bolt is easy to install and serves as a direct replacement for the original part. It meets or exceeds OEM specifications, ensuring a seamless fit and reliable performance. Upgrade your engine with confidence and enhance its overall performance.
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