What is the main advantage of a hydraulic roller camshaft over a flat tappet camshaft?

Hydraulic roller camshafts generally offer reduced friction and wear compared to flat tappet designs. This can lead to more consistent valve lift, improved performance, and a longer lifespan for the camshaft and valvetrain components.

Are there any specific engine configurations this camshaft will NOT fit?

Yes, this camshaft is not compatible with 1965-1966 396 cubic inch Big Block engines that have an oiling groove in the rear journal. For those specific engines, a different camshaft is required.

What kind of performance gains can I expect from this camshaft?

This camshaft is designed for mild performance improvements and is well-suited for pleasure use or specific applications like jet boats. It will provide a noticeable increase in power and torque over a stock camshaft, particularly in the mid-range.

COMP Cams Hydraulic Roller Camshaft 11-451-8 for BBC Engines

Name: COMP Cams Camshaft CB XM 284HR-12
Brand: COMP Cams
Price: 610.12 USD
Availability: InStock

COMP Cams Camshaft CB XM 284HR-12

$610.12

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 Marine hydraulic roller camshaft for BBC 396-454 engines. Ideal for jet boats and mild performance applications.

Key Features

Fits Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Xtreme Marine hydraulic roller camshaft design for improved performance and durability.
Duration at 0.050 inch lift is 230 degrees intake and 236 degrees exhaust.
Lobe separation angle is 112 degrees.
Suitable for jet boat applications with an A impeller.
Good for pleasure or mild performance use.

⚠️ 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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Product Details

This is the COMP Cams Xtreme Marine hydraulic roller camshaft, part number 11-451-8. It's designed for Chevrolet Big Block engines, specifically the 396 to 454 cubic inch displacements, and is a great option if your engine originally came with a flat tappet camshaft. This camshaft is well-suited for applications like jet boats, offering good performance with an A impeller, and it's also a solid choice for general pleasure use or mild performance builds where you want a bit more than stock.

The camshaft features a hydraulic roller design, which generally means less friction and more consistent valve lift compared to flat tappet designs. With a 230/236 degree duration at 0.050 inch lift and a 112-degree lobe separation angle, it's engineered to provide a noticeable improvement in power and torque without being overly aggressive for street or marine use. This makes it a popular choice for those looking to wake up their Big Block without a full engine overhaul. Remember, this camshaft is not CARB approved and cannot be shipped to California.

When installing this camshaft, it's important to note that models from 1965-1966 with a 396 cubic inch engine that have an oiling groove in the rear journal require a different camshaft. If your engine falls into that specific category, please contact us directly to ensure you get the correct part for your application. Otherwise, this 11-451-8 camshaft is ready to go for a wide range of Chevrolet vehicles from the late 60s through the mid-80s, including popular models like the Chevelle, Impala, and C10 pickups.