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

Hydraulic roller camshafts generally offer improved performance and efficiency due to reduced friction. This can lead to better power delivery and a longer lifespan for the camshaft and valvetrain components compared to traditional flat tappet designs.

Will this camshaft fit my 1966 Chevrolet 396 engine?

This specific camshaft (11-445-8) is not compatible with 1965-1966 396 engines that have an oiling groove in the rear journal. If your engine has this feature, you will need to contact COMP Cams directly for an alternative part number.

What kind of idle can I expect with this camshaft?

This camshaft is described as having a good idle, making it well-suited for pleasure boat applications. The specific grind profile is designed to balance performance with a stable idle characteristic.

COMP Cams Camshaft CB XM 270HR-12 11-445-8

Name: COMP Cams Camshaft CB XM 270HR-12
Brand: COMP Cams
Price: 610.12 USD
Availability: InStock

COMP Cams Camshaft CB XM 270HR-12

$610.12

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COMP Cams Xtreme Marine hydraulic roller camshaft for Chevrolet Big Block 396-454 engines. Offers a good idle for pleasure boats.

Key Features

Fits Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Xtreme Marine hydraulic roller camshaft design.
Intake duration at 0.050 inch lift: 218 degrees.
Exhaust duration at 0.050 inch lift: 224 degrees.
Lobe separation angle: 112 degrees.
Offers a good idle, suitable for pleasure boat applications.

⚠️ 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

If you're looking to wake up your Chevrolet Big Block engine, a camshaft upgrade can make a significant difference. This COMP Cams Xtreme Marine hydraulic roller camshaft is designed for 396 to 454 cubic inch engines, offering an improved idle that's well-suited for pleasure boat applications. It's a popular choice for those rebuilding or modifying their engine for a noticeable boost in performance and sound.

This camshaft features a hydraulic roller design, which generally means less friction and better performance compared to flat tappet designs. The grind specifications are 218 degrees of intake duration and 224 degrees of exhaust duration at 0.050 inch lift, with a 112-degree lobe separation angle. This particular profile is known for providing a good idle and strong mid-range power, making it a solid option for marine use where consistent operation is key. It's built to COMP Cams' standards, ensuring it can handle the demands of your engine.

It's important to note that this camshaft is designed for Chevrolet Big Block engines originally equipped with flat tappet camshafts. For 1965-1966 396 engines that have an oiling groove in the rear journal, this specific part number will not fit. If your application requires that oiling groove, COMP Cams offers specific alternatives. Always consult your engine's specifications to ensure proper fitment before installation.