Industrial Injection Duramax Alternate Firing Billet Stage 1 Camshaft W/Key - Industrial Injection

Industrial Injection Duramax Alternate Firing Billet Camshafts

Industrial Injection

SKU: PDM-DMXAFS1

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$1,814⁹⁵

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Free Ground shipping (Over $200*)

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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.

Shipping information

Free economy ground shipping on most orders over $200. This includes lower 48 United States only. Excludes products that must ship freight.

Core Return Info

Read Carefully!

When you purchase a product from our website that has a core requirement, you have two options:

1. You choose to pay the core charge and we will ship the product right away, then once we receive the cores you will be refunded the core charge if your cores pass our inspection qualifications. This is the preferred choice and has the least delays.

2. You choose to send in your cores before we ship the product that was purchased. This choice has the risk of delayed shipment of your purchased product and our inventory is not guaranteed by the time we receive your cores. You will need to follow all of the instructions below as quickly as possible so that you can get your purchased product and we can receive the cores. When you choose this option you acknowledge that by the time we receive your cores, our inventory could have change and there could be a delay in your shipment.

Please return all cores to:

Industrial Injection Core Returns
2858 South 300 West
Salt Lake City, Utah 84115

INCLUDE RA# THAT WAS ISSUED AT TIME OF PURCHASE! If RA # is lost, please call Customer Service at (800) 955-0476. Have your original invoice at time of phone call to give all appropriate information for return.

Core return freight is the responsibility of the customer

FULL CREDIT WILL BE GIVEN WHEN:

In order to receive full core credit, your core(s) must be returned within 90 days from receipt of order. It must be as is “off the engine.” Full core credit will be given if core meets acceptance criteria. Cores that are damaged during shipment to Industrial Injection are the responsibility of the customer and their shipping company.

½ CORE CHARGE CREDIT WILL BE GIVEN WHEN:

Slightly damaged housing or camshaft
Missing parts such as FCA

No Core Credit issued when:

Core is seized or hydraulic head is cracked
Excessive damage ( Heavy use of Bio-diesel and rust are common causes for unacceptable core)
Core is fire damaged
Core is returned after 90 days/3months

Please do the following when returning a core:

Make sure you have removed all fittings from your old unit
Drain all fuel and oil from unit
Package cores so that fuel and oil does not escape from the package

NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays.

Please re-use boxes and bags that parts were shipped in originally. These boxes are UPS approved to reduce damage while being handled in freight.
All shipping charges are the responsibility of the customer
Please write on the box “Core Return” and have RA # clearly written on the outside of box
Include copy of original invoice and RGA inside box

PLEASE RETAIN RA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. We do not research by customer name, only invoice # or RA #.

Industrial Injection Duramax Alternate Firing Billet Camshafts