Stock Replacement LQ4 Camshaft – Replaces GM 12561721
Fits 2001–2007 LQ4 & LQ9 6.0L | 2001–2004 LS1 Engines | 3-Bolt Pattern Camshaft
The Stock Replacement LQ4 Camshaft (Replaces GM 12561721) is designed as a direct replacement for 2001–2007 6.0L LQ4 and LQ9 truck/SUV engines as well as 2001–2004 LS1 applications. Manufactured by Enginetech, this cam delivers factory drivability, smooth idle, and reliable performance without the cost of GM-branded components. Ideal for stock rebuilds or repairs, this camshaft retains original fuel economy and torque characteristics. Compatible with 3-bolt cam sprockets; 2007+ engines will require a 3-bolt conversion kit. Not compatible with VVT systems.
Key Features
- Direct replacement for GM part number 12561721 used in 6.0L LQ4/LQ9 and LS1 engines
- Restores factory idle, torque curve, and drivability for daily-use vehicles and stock rebuilds
- Precision-ground lobes ensure quiet operation and consistent valve timing accuracy
- Compatible with 3-bolt cam sprockets (requires 3-bolt conversion for 2007+)
Camshaft Specifications
- Duration @ .050”: 191° / 194°
- Lift: .469” / .485”
- LSA (Lobe Separation Angle): 116°
- Camshaft Bolt Pattern: 3-Bolt
- Compatibility: Non-VVT engines only
Key Fitments
- CHEVROLET / GMC: Silverado, Sierra, Suburban, Yukon, Yukon XL, and HD Trucks equipped with 6.0L LQ4 or LQ9 (2001–2007)
- PONTIAC / CHEVROLET: LS1-powered Camaro, Firebird, and Corvette (2001–2004)
- Fits 6.0L Gen III LS-based engines using the 3-bolt cam sprocket configuration
Note: Not compatible with Variable Valve Timing (VVT) systems. 2007+ engines require conversion to a 3-bolt cam sprocket setup for use. Always verify camshaft specs and compatibility before installation.
