What is the lobe separation angle for this camshaft?

The COMP Cams XR277HR-12 camshaft features a lobe separation angle of 112 degrees. This specification influences the engine's power band and idle characteristics.

What kind of tuning is required for this camshaft?

This camshaft requires an engine programmer to adjust for the new valve timing and airflow characteristics. Proper tuning is essential for optimal performance and engine health.

Is this camshaft compatible with engines that have DOD or AFM?

While this camshaft is designed for GM LS Gen III/IV engines, it is not specifically listed as compatible with DOD (Displacement on Demand) or AFM (Active Fuel Management) systems without modification or disabling of those features. It's best to consult the manufacturer's detailed fitment notes or contact them directly for specific compatibility with DOD/AFM equipped engines.

COMP Cams LS1 XR277HR-12 Camshaft 54-418-11

Name: COMP Cams Camshaft LS1 XR277HR-12
Brand: COMP Cams
Price: 555.48 USD
Availability: InStock

COMP Cams Camshaft LS1 XR277HR-12

$555.48

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 XR277HR-12 hydraulic roller camshaft for GM LS Gen III/IV engines. Designed for street/strip use with improved performance.

Key Features

Fits 4.8, 5.3, 5.7, 6.0, 6.2 and 7.0 Liter LS1, LS2, LS3, LS4, LS6, LS7 plus SUV and Truck Engines.
Hydraulic roller camshaft designed for GM LS Gen III/IV engines.
Features a 224-degree intake and 228-degree exhaust duration.
Has a 112-degree lobe separation angle.
Designed for street/strip applications.
Works well with FAST LSX intake manifolds.

⚠️ 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 XR277HR-12 hydraulic roller camshaft, a popular choice for GM LS Gen III and IV engines. It's designed to give your engine a noticeable bump in performance for street and strip applications. If you're looking to get more out of your LS-based engine, whether it's in a Camaro, Corvette, or a Silverado truck, this camshaft can help you achieve that goal.

The XR277HR-12 features a 224-degree intake and 228-degree exhaust duration with a 112-degree lobe separation angle. This specific grind is well-suited for engines ranging from 4.8L up to 7.0L, including popular displacements like the 5.7L LS1 and 6.0L LS2. It's designed to work effectively with intake manifolds like the FAST LSX, and you will need an engine programmer to adjust for the camshaft's new parameters. This camshaft is a solid option for those building a street/strip car or looking for a more aggressive feel in their daily driver.

When installing this camshaft, remember that it's a significant upgrade and will require proper tuning to realize its full potential. 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 fitting this camshaft to your specific LS engine.