OEM Part Number: 12557840, 917-139 Harmonic Balancer Bolt
Fitment: GM Harmonic Balancer Bolt fit for all Gen. 3 and 4 LS engines. LS1 LS2 LS3 LS6 L59 L92 L96 L99 LC9 LH8 LMF LMG LY5 LM7 LR4 LMG LQ4 LQ9 4.8L 5.3L 5.7L 6.0L 6.2L Engines (DO NOT INCLUDE LS7/LS9)
Material: Engine Harmonic Balancer Bolt is made of premium quality steel with High Strength Grade 10.9, strong and reliable, not easy to break or deform, can be used for a long time.
Size: Grade 10.9 Automotive Bolt, M16 x 2 Thread x 4.05 inch (underhead size) , Anti-Corrosion Dacromet Coating.
Easy to Install: This product is simple to use and easy to operate. It's designed for easy installation so you can quickly and easily replace your old mounting kit.