General Motors® (01-07) Camaro/Corvette/Silverado/Sierra LS1/LQ4/LQ9 OEM 3-Bolt Hydraulic Roller Camshaft

GM 12561721 is a factory stock hydraulic roller camshaft used in Gen III General Motors LS-series engines. It is the original equipment for 2001–2004 Corvette (LS1) and 2002–2006 Truck/SUV (LQ9/LQ4) applications.

The GM Genuine Parts Engine Camshaft (12561721) features a 3-bolt cam sprocket pattern and is designed to maintain smooth idle quality, factory drivability, and dependable fuel mileage. It is also widely used as a budget-friendly performance upgrade for smaller 5.3L truck engines (like the LM7) to yield low-end and mid-range torque gains.

The vehicles and engine configurations that fit this camshaft include:

Cadillac

Escalade (6.0L V8) | 2002–2006

Escalade ESV (6.0L V8) | 2003–2006

Escalade EXT (6.0L V8) | 2002–2006 

GM parts

Chevrolet

Camaro (5.7L LS1) | 2001–2002

Corvette (5.7L LS1) | 2001–2004

Express 2500 / 3500 (6.0L V8) | 2003–2007

Silverado 1500 / 1500 Classic (6.0L V8) | 2001–2007

Silverado 2500 / 2500 Classic (6.0L V8) | 2001–2007

Silverado 3500 / 3500 Classic (6.0L V8) | 2001–2007

Suburban 1500 / 2500 (6.0L V8) | 2001–2006

Tahoe (6.0L V8) | 2001–2005 

GMC

Savana 2500 / 3500 (6.0L V8) | 2003–2007

Sierra 1500 / 1500 Classic (6.0L V8) | 2001–2007

Sierra 2500 / 2500 Classic (6.0L V8) | 2001–2007

Sierra 3500 / 3500 Classic (6.0L V8) | 2001–2007

Yukon / Yukon XL 1500 / 2500 (6.0L V8) | 2001–2006 

Hummer

H2 (6.0L V8) | 2003–2007 

Pontiac

Firebird (5.7L LS1) | 2001–2002

GTO (5.7L LS1) | 2004