What kind of idle can I expect with this camshaft?

This COMP Cams Xtreme Energy camshaft is designed for performance and typically results in a rougher idle. This is a common characteristic for camshafts that offer improved performance for street and strip use.

What other parts do I need to install this camshaft?

When installing a new camshaft, it's highly recommended to replace your valve springs, lifters, and pushrods to ensure proper operation and longevity. Always refer to the manufacturer's installation instructions for a complete list of recommended components and procedures.

Will this camshaft fit my 1966 Chevrolet 396 Big Block?

This specific camshaft (part number 11-678-5) will not fit 1965-1966 396 Big Block engines that have an oiling groove in the rear journal. For those specific applications, you will need to contact COMP Cams directly to order a compatible camshaft.

COMP Cams Camshaft CB XS282S-10 11-678-5

Name: COMP Cams Camshaft CB XS282S-10
Brand: COMP Cams
Price: 378.78 USD
Availability: InStock

COMP Cams Camshaft CB XS282S-10

$378.78

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 Xtreme Energy camshaft for Chevrolet Big Block 396-454 engines. Designed for street/strip use with a rough idle.

Key Features

Fits Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Xtreme Energy series camshaft with a 244/252 degree intake/exhaust duration.
Designed for street/strip applications, performing best with a 3000+ RPM stall torque converter.
Likes headers and gears for improved performance.
Expect a rough idle characteristic of performance camshafts.
Solid flat tappet design.

⚠️ 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

If you're looking to give your Chevrolet Big Block engine a serious boost for street and strip use, this COMP Cams Xtreme Energy camshaft is a solid option. It's built for engines like the 396, 427, and 454 cubic inch V8s found in popular vehicles like the Chevrolet Impala, Chevelle, and Camaro. This camshaft is designed to work well with a 3000+ RPM stall torque converter and headers, giving you improved performance when you hit the gas.

This is a solid flat tappet camshaft, meaning it uses a traditional design that's well-known for its durability. You can expect a noticeable change in your engine's character, including a rougher idle, which is typical for cams with this kind of performance profile. It's a popular choice for builders who want to extract more power from their Big Block, especially when paired with appropriate gearing and exhaust systems.

Keep in mind that this camshaft is intended for off-road or racing applications and is not CARB approved, so it cannot be shipped to California. If your Big Block is a 1965-1966 396 model with an oiling groove in the rear journal, this specific camshaft will not fit. For those specific applications, you'll need to contact COMP Cams directly for a special order.