What kind of performance gains can I expect with this camshaft?

This camshaft is designed for modified performance applications, meaning it works best when paired with other upgrades like exhaust systems and programmers. You can expect improved throttle response and increased power output due to optimized airflow from its 197/202 duration profile.

Is this camshaft suitable for towing?

Yes, this camshaft is designed to be good for limited towing applications. While it's built for performance, it maintains a level of usability for towing when used in conjunction with other supporting modifications.

What is piston-to-valve clearance and why is it important?

Piston-to-valve clearance refers to the space between your engine's valves and pistons when they are at their highest points. It's critical because insufficient clearance can lead to interference, causing severe engine damage. COMP Cams recommends a minimum of .080" intake and .120" exhaust clearance for this camshaft.

COMP Cams Camshaft 132-501-12 for GM 6.6L Duramax Diesel

Name: COMP Cams Camshaft Gm6.6L Duramax 258Xd
Brand: COMP Cams
SKU: comp-cams-comp-cams-camshaft-gm6-6l-duramax-258xd-t14-4390529
Price: 975.86 USD
Availability: BackOrder

COMP Cams Camshaft Gm6.6L Duramax 258Xd

$975.86

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams camshaft for GM 6.6L Duramax Diesel. Designed for modified performance applications with limited towing capability.

Key Features

Fits Chevrolet and GMC 6.6L Duramax diesel engines from 2001-2016.
Mechanical roller camshaft designed for modified performance applications.
Features a 197/202 duration profile for improved airflow and power.
Suitable for limited towing applications when used with supporting modifications.
COMP Cams recommends checking piston-to-valve clearance during installation.
Not CARB approved; cannot be shipped to California.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

This is the COMP Cams Tri-Power Xtreme camshaft, part number 132-501-12, built for GM 6.6L Duramax diesel engines. If you've upgraded your exhaust and programmer, or are planning to, this camshaft is designed to work with those modifications to unlock more performance. It’s a solid roller design, which is a step up from the factory hydraulic roller setup, offering more aggressive lift and duration for increased airflow and power potential.

COMP Cams engineered this camshaft for modified performance applications, meaning it’s best suited for trucks that have already seen some upgrades like exhaust systems or engine tuners. While it’s designed for performance, it’s still good for limited towing, so you don’t have to completely sacrifice utility. The lift and duration figures are optimized for a noticeable improvement in throttle response and overall power output when paired with other supporting modifications. Remember, when installing any camshaft, especially one with more aggressive specs like this, it's crucial to check piston-to-valve clearance. Modern engine designs often have tight clearances, and COMP Cams recommends a minimum of .080 inches on the intake side and .120 inches on the exhaust side to prevent interference.

This camshaft fits a wide range of GM trucks and SUVs, including popular models like the Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD from the early 2000s through 2016, as well as the Chevrolet Express and GMC Savana vans. It's important to note that this camshaft is not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for detailed guidance on checking clearances and proper installation procedures.