CHENACC LS Harmonic Balancer Bolt 12557840 for Gen 3/4 LS Engines
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Description
xOverview
Meet the CHENACC LS Harmonic Balancer Bolt, a robust OEM-grade fastener designed to secure the harmonic balancer on Gen 3 and Gen 4 LS engines. With part references 12557840 and 917-139, this bolt is built to match the original hardware, delivering dependable fitment without guesswork. It combines precise threading and a durable build to support steady accessory alignment under typical driving conditions.
Designed to fit a wide range of LS models (LS1, LS2, LS3, LS6, L59, L92, L96, L99, LC9, LH8, LMF, LMG, LY5, LM7, LR4, LQ4, LQ9) and family brackets, this bolt helps you maintain a balanced engine bay when replacing worn or corroded fasteners. While LS7 and LS9 are not included in this lineup, the rest of Gen 3 and Gen 4 engines can benefit from a replacement that mirrors the original fastener's dimensions and threading, supporting reliable operation without overengineering.
Key features
- OEM part numbers: 12557840, 917-139 align with the original hardware
- Fitment: Gen 3 and Gen 4 LS engines including LS1, LS2, LS3, LS6, L59, L92, L96, L99, LC9, LH8, LMF, LMG, LY5, LM7, LR4, LQ4, LQ9
- Material & coating: Grade 10.9 alloy steel with a protective Dacromet finish for rust and corrosion resistance
- Size & thread: M16 x 2 thread, 4.05 inch underhead for secure seating
- Ease of use: Engineered for straightforward installation to replace an aging mounting bolt quickly
Materials, coating, and durability
The bolt uses premium Grade 10.9 steel, chosen for strength under load. The Dacromet coating adds rust resistance, making it well suited to engine bays where heat and humidity rise during daily driving or occasional track days. The combination aims to offer long-term reliability without compromising serviceability.
Installation and guidance
Designed with user-friendly installation in mind, this fastener is compatible with standard LS-bolt installations. Align the bolt with the harmonic balancer and torque to the manufacturer’s specification. This approach can help minimize install time and avoid cross-threading during replacement.
Why CHENACC
CHENACC provides a match for OEM specifications and a clean engine bay appearance. The part numbers 12557840 and 917-139 are included to help you verify correct fitment. Consider this bolt if you’re refreshing components as part of an engine maintenance routine or rebuild planning.
Notes
Review your engine family and the assembly you’re working on to confirm fitment. This bolt is not intended for LS7 or LS9 configurations.
FAQ
Q: What engines is the CHENACC LS Harmonic Balancer Bolt compatible with?
A: Designed for Gen 3 and Gen 4 LS engines; not for LS7 or LS9. Verify with OEM numbers 12557840 or 917-139.
Q: What makes this bolt durable and easy to install?
A: Grade 10.9 steel with a Dacromet coating provides corrosion resistance; installation is straightforward with standard tools.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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