DIY Stroker CP3 Kit

Upgrade your CP3 pump and unleash more fuel flow and horsepower with the DIY Stroker CP3 Kit from Motorsport Diesel. Designed for performance enthusiasts who want more out of their factory pump, this kit delivers increased output, durability, and DIY satisfaction-all in one box.

Developed by the team that pioneered the first stroker CP3 on the market, this kit represents the latest evolution in CP3 modification technology. With a refined stroke length that balances high flow and long-term reliability, this kit is ideal for both high-performance applications and stock trucks.

Unlike many advertised 10mm strokers that fall short in actual performance, this kit offers real, tested gains with easy installation and clear instructions to get you up and running quickly.

Key Features:

• Increased Fuel Output: Designed to deliver a measurable increase in flow over stock without over-stroking or stressing pump internals.
• Balanced Stroke Geometry: Optimized stroke length provides strong output while maintaining long-term reliability.
• DIY-Friendly Installation: Includes detailed instructions and access to video guides. No guesswork, no core charge, no shipping your pump out.
• Precision Engineering: Machined in-house to exacting standards.
• Affordable Power: Build it yourself and save.

Why Go DIY?

This kit gives you the flexibility to upgrade on your terms. Whether you’re a professional builder or a weekend warrior, the DIY Stroker CP3 Kit lets you retain your existing pump and still achieve the gains you’re after. Installation is straightforward, and the end result is the same strong fueling you’d expect from a high-dollar stroker, but without the premium price tag.

Whether you’re rebuilding a tired CP3 or just looking to give your truck the fueling it’s been asking for, this kit gives you the parts to do it right.

What’s In the Box?

• 1x Motorsport Diesel Stroker Shaft (9.5 / 9.8 / 10.6mm)

• 1x Cascade Valve Modification Kit

• 1x Large Diameter Surface Area Tappet set (10.6mm)

• (Optional) CP3 Shaft Press Tool – saves $30 when bundled

Application/Stroke:

• 2003–2007 5.9 Cummins 9.8mm Stroke

• 2007.5-2025 6.7 Cummins (not retro-fitted from CP4 pumps) 9.5 / 10.6mm Stroke

• 2001-2006 Duramax LB7/LLY (except 0 445 020 005 and/or 8mm supply pump drive on OEM 2001-2002 LB7) 9.5mm Stroke

• 2006-2010 Duramax LBZ/LMM 9.5 / 10.6mm Stroke

FAQ

Q: Do you offer a 12mm stroker?
A: Yes, but not DIY. 12mm requires machining and careful clearancing to keep geometry and reliability.

Q: Can I buy a 12mm shaft from you?
A: Yes, Builder Network only. We sell 12mm shafts to trained/approved builders, not direct to public.

Q: Why Builder Network only?
A: Because wrong machining or clearances can cause fast failure. 12mm is not “send it” parts. We protect your wallet and our inbox.

Q: How do I get a 12mm build?
A: Choose a Builder Network shop, or apply to join the Builder Network if you are a qualified builder.

Builder Network

Become a Builder Network Partner

We train qualified shops/builders and supply 12mm shafts for professional builds.

Typical requirements:

• Proper machining capability and measurement tools

• Ability to verify clearances and assemble clean

• Experience with CP3 internals or equivalent high-precision assembly

• Willing to follow build standards (not “close enough”)

• Flow testing of completed assemblies

To apply: sales@motorsportdiesel.com
Include shop name, location, equipment list, and experience.

Upgrade your fueling system today to unlock more flow, more power, and more control with the DIY Stroker CP3 Kit from Motorsport Diesel. Your truck will thank you!