What is the recommended compression ratio for this camshaft?

For optimal performance with the COMP Cams XE284H-10 camshaft, a compression ratio of 9.5:1 or higher is recommended. This ensures the engine can effectively utilize the camshaft's improved airflow characteristics.

Will this camshaft fit my 1966 Chevrolet 396 Big Block with a rear journal oiling groove?

No, this specific part number (11-250-3) will not fit 1965-1966 Big Block models that have an oiling groove in the rear journal. You will need to contact COMP Cams directly for a camshaft that includes this feature.

What kind of idle can I expect with this camshaft?

This is an Xtreme Energy camshaft designed for performance, so it will have a rough idle. This is a characteristic of cams with aggressive lift and duration profiles, indicating it's tuned for power.

COMP Cams Camshaft CB XE284H-10 11-250-3

Name: COMP Cams Camshaft CB XE284H-10
Brand: COMP Cams
Price: 287.87 USD
Availability: InStock

COMP Cams Camshaft CB XE284H-10

$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 Xtreme Energy camshaft for Chevrolet Big Block 396-454 engines. Offers street/strip performance with a rough idle.

Key Features

Fits a wide range of Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Xtreme Energy series camshaft with 240/246 degrees duration at .050 lift.
Designed for street/strip performance applications.
Requires a minimum of 9.5:1 compression ratio.
Recommended for use with a 2800+ RPM stall speed torque converter.
Expect a rough idle characteristic of performance camshafts.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

If you're looking to get more out of your Chevrolet Big Block engine, a camshaft upgrade like this COMP Cams Xtreme Energy camshaft can make a significant difference. This particular cam is designed for street/strip applications, meaning it's built to perform well both on the road and at the drag strip. It's a popular choice for those aiming for improved performance from their 396 to 454 cubic inch engines.

This camshaft features a 240/246 degree intake/exhaust duration at .050 lift, which contributes to its aggressive nature and the rough idle you can expect. To get the most out of this cam, it's recommended to have at least 9.5:1 compression and a 2800+ RPM stall speed torque converter. This setup ensures the engine can effectively utilize the increased airflow the camshaft provides, translating into noticeable power gains.

It's important to note that this camshaft is intended for engines originally equipped with flat tappet camshafts. If your 1965-1966 Big Block has a rear journal oiling groove, this specific part number will not fit. For those specific applications, COMP Cams offers alternative options. This camshaft fits a wide range of Chevrolet vehicles, including popular models like the C10 Pickup, Impala, and Camaro, among many others.