6.6L Duramax L5P CCV Upgrade Kit | GM 2017-2024

Overview

The L5P CCV upgrade kit is a direct replacement for the factory crankcase ventilation system, designed to eliminate restriction, prevent pressure buildup, and improve long-term reliability on 2017–2024 6.6L Duramax engines. By replacing the OEM plastic housing with a billet assembly, it resolves common issues like clogging and oil leaks associated with the stock CCV system.

Compatibility

• Years: 2017–2024
• Makes: Chevrolet, GMC
• Models: Silverado 2500HD / 3500HD, Sierra 2500HD / 3500HD
• Engine: 6.6L Duramax L5P Diesel

Technical Specifications

What's In the Kit & How It's Built

• Billet Aluminum CCV Housing – CNC-machined from solid billet aluminum to replace the weak OEM plastic unit. No more cracking, warping or heat-related failure. Built to last the life of the truck.
• Optimized Internal Flow Path – The internal design moves more air with less restriction than the factory crankcase filter setup. Better flow means less pressure buildup and a healthier engine long-term.
• Precision O-Ring Sealing – Tight O-ring seals at every mating surface keep oil vapor where it belongs — inside the system. No seeping, no mess.
• Everything You Need Included – This is a complete CCV kit. All components needed for a full CCV system replacement are in the box. No separate trips to the parts store.
• Bolt-On Fitment – Machined to match factory mounting points exactly. Drop it in, torque it down, and you're done. No cutting, drilling, or fabrication needed.

Why Upgrade Your L5P CCV System?

• Fix Crankcase Pressure Problems for Good – The stock CCV system is known to clog and restrict over time. This kit restores proper ventilation and keeps crankcase pressure in check, reducing wear on engine seals and gaskets.
• Stop Oil Leaks Before They Start – Excess crankcase pressure is one of the leading causes of rear main seal and oil pan gasket leaks on the L5P. Upgrading the CCV is one of the best preventive steps you can take.
• Ditch the Failure-Prone L5P OEM Plastic – GM's factory housing is plastic. It clogs, it cracks, and it fails. This billet replacement eliminates those weak points entirely.
• Built for the Long Haul – Whether you're towing heavy every week or putting serious miles on your Duramax, this kit is engineered to hold up under sustained heat, oil exposure, and load without degrading.
• Cleaner, More Professional Engine Bay – The billet aluminum finish looks sharp under the hood and is easy to inspect and service down the road.

Installation

This is a direct bolt-on replacement that any experienced DIYer or shop mechanic can handle with basic hand tools. Most installs take about an hour, including removal of the factory CCV assembly. No tuning required after install — the upgraded system runs entirely within factory parameters.

Frequently Asked Questions

Q: Does this fully replace the factory CCV system on the L5P Duramax?
A: Yes. This kit replaces the entire OEM crankcase ventilation housing and internal filter assembly. Once installed, the factory unit is out for good.

Q: My L5P has a clogged CCV filter will this fix it?
A: Yes, that's exactly what this kit is designed for. It clears the restriction caused by a clogged CCV filter and upgrades the system so clogging isn't an issue going forward.

Q: Is this the same as an L5P intake horn PCV delete or reroute?
A: No. This is a closed-system CCV upgrade — it improves ventilation flow while keeping proper routing intact. If you're also looking to upgrade intake airflow, the L5P turbo intake horn is a separate bolt-on available here: L5P Turbo Intake Horn.

Q: Do I need a tune after installing this CCV upgrade?
A: No. This is a direct replacement that operates within factory parameters. No ECM tuning needed.

Q: Will this work with other L5P upgrades I already have installed?
A: Yes. This kit is designed to be compatible with common L5P Duramax performance and maintenance upgrades without any fitment conflicts.