Industrial Injection Duramax Alternate Firing Billet Camshafts

Unlock smoother operation, stronger power delivery, and enhanced durability in your Duramax engine with Industrial Injection Alternate Firing Billet Camshafts. Designed for high-performance street trucks, towing applications, and competition builds, these billet camshafts feature an optimized alternate firing order that improves cylinder balance, reduces harmonics, and increases valvetrain stability under high load.

One of the biggest advantages of an alternate firing camshaft is its ability to extend the life of your crankshaft by changing the firing order of your engine. The OEM Duramax firing order ends with cylinder 3 and begins with cylinders 1 and 2, creating a 3-1-2 hit to the crankshaft. Duramax cranks are known to have a tendency to break right behind the first rod throw at the intersection of the second main journal. This is exactly where this 3-1-2 hit places the greatest stress. By redistributing cylinder firing events, Industrial Injection’s alternate firing camshaft helps reduce concentrated torsional loads and improves overall crankshaft longevity.

Manufactured from premium billet steel and precision-ground to exacting tolerances, Industrial Injection Duramax alternate firing cams deliver improved airflow, enhanced combustion efficiency, and a broader, more usable powerband compared to factory camshafts. Whether you're upgrading a stock engine or building a high-horsepower setup, this camshaft is engineered to handle extreme cylinder pressures while maintaining reliable street manners.

Key Features & Benefits

• Alternate firing order design for improved cylinder balance and smoother operation

• CNC-machined billet steel construction for maximum strength and durability

• Optimized cam profiles for increased airflow and combustion efficiency

• Improved mid-range and top-end power without sacrificing drivability

• Reduced valvetrain harmonics and stress at high RPM

• Direct performance upgrade for performance, towing, and racing applications

STAGE 1

(PN: PDM-DMXAFS1)

• 1000+hp Capable
• Alternate Firing Order (relieves stress on crankshaft)
• Billet For Ultimate Strength
• Keyed To Prevent Cam Gear Slipping
• Requires 130# Valve Springs

STAGE 2

(PN: PDM-DMXAFS2)

• 1500+hp Capable
• Alternate Firing Order (relieves stress on crankshaft)
• Billet For Ultimate Strength
• Keyed To Prevent Cam Gear Slipping
• .085" Valve Reliefs Required
• Requires 130# Valve Springs

*Piston to valve clearance should always be measured when installing an aftermarket camshaft.

The core must be returned within 90 days for full credit.

*All Industrial Injection Performance Products Are Not Legal For "On-Road", "Off-Road", or "Dual-Use". These Products May Only Be Used In " Dedicated Competition Use Only" Vehicles. Compliance With State and Federal Emission Standards Is The Consumer's Responsibility.