What is the recommended stall speed for this camshaft?

For optimal performance with the COMP Cams CB X4 270H-11 camshaft, a torque converter with a 2000 RPM stall speed or higher is recommended. This helps ensure the engine stays in its power band during acceleration.

Will this camshaft fit my 1966 Chevrolet 396 Big Block?

This camshaft will not fit 1965-66 396 Big Block models that have an oiling groove in the rear journal. If your engine has this feature, you will need to contact COMP Cams directly for a compatible camshaft.

What other modifications are suggested when installing this camshaft?

To get the most out of this camshaft, it's best paired with an improved intake manifold, headers for better exhaust flow, and a rear gear ratio between 3.55 and 3.90. These components work together to enhance engine performance.

COMP Cams CB X4 270H-11 Hydraulic Flat Cam 11-239-3

Name: COMP Cams Camshaft CB X4 270H-11
Brand: COMP Cams
Price: 287.87 USD
Availability: InStock

COMP Cams Camshaft CB X4 270H-11

$287.87

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 CB X4 270H-11 hydraulic flat camshaft for Chevrolet Big Block 396-454 engines. Best with improved intake, headers, and 3.55-3.90 gears.

Key Features

Fits Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Features 226 degrees of intake duration and 234 degrees of exhaust duration at .050 lift.
Hydraulic flat tappet design for reliable operation.
Recommended for use with improved intake manifold, headers, and 3.55-3.90 rear gears.
Requires a torque converter with a 2000+ RPM stall speed.
Not CARB approved and 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 COMP Cams Xtreme 4x4 camshaft features a 226-degree intake and 234-degree exhaust duration at .050 lift. It's designed for Chevrolet Big Block engines from 396 to 454 cubic inches that originally came with a flat tappet camshaft. This camshaft is a solid choice if you're looking to improve your engine's performance beyond stock, especially when paired with an improved intake manifold, headers, and a gear ratio in the 3.55 to 3.90 range, along with a 2000+ stall torque converter.

The CB X4 270H-11 is a well-built hydraulic flat tappet camshaft, meaning it uses a simple and reliable valvetrain design. While it fits a wide range of Chevrolet vehicles from the late 60s through the mid-90s, including popular models like the C10 Pickup, Camaro, and Impala, it's important to note that it is not CARB approved and cannot be shipped to California. If your Big Block has an oiling groove in the rear journal, common on 1965-66 396 models, this specific camshaft will not fit, and you'll need to contact COMP Cams for a different option.