What is the recommended stall speed for this camshaft?

This COMP Cams Xtreme Energy camshaft is designed for optimal performance with a torque converter that has at least a 2500 RPM stall speed. Using a converter within this range will help you take full advantage of the improved mid-range torque and throttle response.

Will this camshaft fit my 1966 Chevrolet 396 Big Block?

No, this specific camshaft (11-677-4) is not compatible with 1965-1966 396 Big Block engines that have an oiling groove in the rear journal. You will need to contact COMP Cams directly to find a camshaft that accommodates that specific engine feature.

What other parts might I need when installing this camshaft?

When installing a new camshaft, it's highly recommended to replace your lifters, valve springs, and pushrods to ensure proper operation and longevity. You may also need a new timing set and gasket set for a complete installation.

COMP Cams Camshaft CB XS274S-10 11-677-4

Name: COMP Cams Camshaft CB XS274S-10
Brand: COMP Cams
Price: 323.69 USD
Availability: InStock

COMP Cams Camshaft CB XS274S-10

$323.69

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 solid flat camshaft for Chevrolet Big Block 396-454 engines. Offers strong mid-range torque and throttle response.

Key Features

Fits 1967-1995 Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Offers strong mid-range torque and throttle response.
Designed for use with a torque converter stall speed of 2500 RPM or higher.
Features 236 degrees of intake duration and 242 degrees of exhaust duration at .050 inch lift.
Solid flat tappet design for performance applications.
Not CARB approved; cannot ship 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 Xtreme Energy solid flat tappet camshaft, part number 11-677-4, designed for Chevrolet Big Block 396 to 454 cubic inch engines originally equipped with flat tappet camshafts. It's built to give you a noticeable boost in mid-range torque and throttle response, making it a popular choice for builds that see a lot of street driving and demand quick acceleration out of corners. You'll want to pair this with a torque converter that has at least a 2500 RPM stall speed to get the most out of its performance characteristics.

The XS274S-10 camshaft features a 236-degree intake and 242-degree exhaust duration at .050 inch lift. This profile is well-suited for engines looking for improved performance without sacrificing too much drivability. It's a well-built component from COMP Cams, a well-known name in performance engine parts, and is designed to be a direct fit for the specified Chevrolet Big Block applications, including popular models like the Chevrolet Impala, Chevelle, and Camaro from the late 60s through the mid-70s, as well as C/K series trucks.

Please note that this camshaft is not CARB approved and cannot be shipped to California. Also, be aware that 1965-1966 396 Big Block engines have an oiling groove in the rear journal that this specific camshaft does not accommodate. If your engine requires that groove, you'll need to contact COMP Cams directly for assistance with a different part number.