Product Description
Michigan Motorsports Performance Heavy Duty Timing Chain
Replaces GM Part Numbers 12646386 & 12586482 | Fits All LS-Based Engines
The Michigan Motorsports Performance Heavy Duty Timing Chain is engineered for superior strength and reliability in high-performance LS engine builds. Featuring upgraded alloy steel construction with thicker side plates, this heavy-duty single roller chain delivers exceptional durability and wear resistance under extreme load and RPM conditions. It is a direct-fit replacement for factory GM timing chains, designed to be compatible with all LS-based engines while maintaining precise timing and quiet operation. Perfect for both stock rebuilds and high-performance applications demanding greater strength than OEM components.
Key Features
- Direct replacement for GM part numbers 12646386 and 12586482
- Constructed from high-strength alloy steel for maximum durability and reliability
- Thicker side plates improve tensile strength and chain stability under high load
- Compatible with stock LS gears — no modification required for installation
- Ideal upgrade for high-performance and boosted LS engine builds
- Engineered by Michigan Motorsports for precise timing accuracy and long service life
Key Fitments
- Fits all GM LS-based V8 engines: LS1, LS2, LS3, LS6, LQ4, LQ9, LY6, L92, L76, L77, L9H, L33, LM7, LR4, LY2, L20, and more
- Compatible with both cathedral port (Gen III) and rectangle port (Gen IV) cylinder head applications
- For use in 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L LS engine platforms
Note: This is a single roller timing chain compatible with stock LS gears. Designed as a heavy-duty performance upgrade offering greater strength than OEM chains — ideal for both street performance and racing applications.
