What is the intended use for the COMP Cams CB XM 298H-12 camshaft?

This camshaft is specifically designed for performance applications like river drags and bracket racing. It's intended for Chevrolet Big Block engines with 10.0:1 or higher compression ratios, aiming to improve mid-range and top-end power.

Does this camshaft fit all Chevrolet Big Block 396 engines?

No, this camshaft is not compatible with 1965-1966 396 Big Block engines that have an oiling groove in the rear journal. For those specific engines, you will need to contact COMP Cams for an alternative part.

What type of lifters does this camshaft use?

This is a hydraulic flat tappet camshaft. This design uses hydraulic lifters which automatically adjust to maintain zero valve lash, making it easier to set up and maintain compared to solid lifter camshafts.

COMP Cams Camshaft CB XM 298H-12 | 11-252-4

Name: COMP Cams Camshaft CB XM 298H-12
Brand: COMP Cams
Price: 323.69 USD
Availability: InStock

COMP Cams Camshaft CB XM 298H-12

$323.69

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COMP Cams Xtreme Marine camshaft 11-252-4 for BBC 396-454 engines. Designed for river drags and bracket racing.

Key Features

Fits Chevrolet Big Block 396-454 engines originally equipped with flat tappet camshafts.
Xtreme Marine series camshaft designed for river drags and bracket racing applications.
Features 254 degrees intake duration and 264 degrees exhaust duration at .050 inch lift.
Provides .525 inch intake lift and .540 inch exhaust lift.
Intended for engines with 10.0:1 or higher compression ratios.
Hydraulic flat tappet design simplifies setup and maintenance.

⚠️ 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 building a performance engine for river drags or bracket racing, a camshaft like the COMP Cams CB XM 298H-12 can make a big difference. This camshaft is designed for Chevrolet Big Block engines, specifically the 396 to 454 cubic inch displacements, and is intended for use with engines that have 10.0:1 or higher compression ratios. It's a hydraulic flat tappet camshaft, meaning it uses hydraulic lifters to maintain zero valve lash automatically, simplifying setup and maintenance compared to solid lifters.

This particular camshaft features a 254-degree intake duration and 264-degree exhaust duration at .050 inch lift, with a .525 inch intake lift and .540 inch exhaust lift. These specifications are tuned for aggressive performance in marine applications with specific impeller types or in demanding bracket racing scenarios. It's built with a focus on delivering strong mid-range and top-end power, which is crucial for applications where consistent performance under load is key.

It's important to note that this camshaft is not compatible with 1965-1966 396 Big Block engines that have an oiling groove in the rear journal. If your engine falls into that specific category, you'll need to contact COMP Cams directly for a different camshaft option. For most other Chevrolet Big Block applications originally equipped with flat tappet camshafts, this is a solid option for improved performance.