Industrial Injection PDM-DMXAFS1 Duramax Alternate Firing Billet Race Stage 1 Camshaft with Key

The Industrial Injection PDM-DMXAFS1 is a Duramax Alternate Firing Sequence (AFS) Billet Race Stage 1 Camshaft designed for high-performance diesel applications. This camshaft utilizes an alternate firing order strategy to improve cylinder-to-cylinder balance, reduce torsional stress on the crankshaft, and optimize combustion efficiency — making it a popular upgrade for serious performance and competition builds.

Machined from high-grade billet steel, this Stage 1 grind is engineered to complement performance injector and turbo upgrades while maintaining reliable street and track drivability. The included camshaft key ensures precise timing alignment during installation.

Key Features:

• Alternate Firing Sequence (AFS) design for improved combustion balance and reduced drivetrain stress
• Stage 1 performance grind — ideal for mildly to moderately built Duramax diesel engines
• Precision-machined from billet steel for superior strength and durability over OEM cast units
• Includes camshaft timing key for accurate installation and timing alignment
• Designed to work with performance injectors, turbos, and supporting fueling modifications
• Engineered specifically for GM Duramax diesel engines

The PDM-DMXAFS1 is a direct upgrade for Duramax owners looking to maximize power output while improving engine smoothness and longevity under high-load conditions. As a Stage 1 unit, it offers an excellent entry point into AFS camshaft technology without sacrificing everyday usability.