Harmonic Balancer Bolt 12pt GM LS Gen III/IV

The Harmonic Balancer Bolt 12pt GM LS Gen III/IV by MOROSO is a precision fastener designed for high-performance LS engine builds where reliability and proper clamping force are essential. This 12-point bolt secures the harmonic balancer, a vital component that dampens crankshaft vibration and protects your engine from destructive resonance frequencies. Ideal for street engines, track machines, or supercharged setups, this bolt provides the necessary holding power to keep your balancer securely in place under extreme conditions.

The 12-point design of this harmonic balancer bolt offers superior engagement compared to standard 6-point fasteners, reducing the risk of rounding and allowing for more precise torque application. This is critical when working with LS Gen III and Gen IV engines, where factory specifications demand exact clamping loads. Manufactured to strict tolerances using high-strength steel, MOROSO fasteners ensure consistent performance across repeated engine start cycles and high-RPM operation.

This bolt is essential for LS Gen III (1997–2007) and LS Gen IV (2005–2017) engine enthusiasts performing balancer replacement, timing chain service, or complete engine assembly. Proper installation requires adherence to factory torque specifications to ensure optimal performance and longevity. With its compact dimensions and robust design, this bolt is a reliable choice for any serious engine builder.