How do I know if my engine has a flat tappet or roller camshaft?

For Chevrolet Small Blocks, especially those from 1985 and newer, it's best to remove the intake manifold or timing cover to visually inspect the camshaft lobes. Factory roller camshafts have a different design than the flat tappet style this camshaft is designed for.

What kind of idle can I expect with this camshaft?

This camshaft is designed for high performance, particularly in marine applications. As such, it will produce a rough idle, which is a common characteristic of cams with this level of performance.

Does this camshaft come with any installation hardware?

This product listing is for the camshaft only. It is recommended to consult the manufacturer's installation instructions for a complete list of required hardware and components for proper installation.

COMP Cams Hydraulic Flat Tappet Camshaft 12-244-4

Name: COMP Cams Camshaft CS XM 278H-12
Brand: COMP Cams
Price: 320.45 USD
Availability: InStock

COMP Cams Camshaft CS XM 278H-12

$320.45

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 camshaft for Chevy Small Blocks. Hydraulic flat tappet design for improved off-shore performance.

Key Features

Fits 1958-2002 Chevrolet Small Block engines from 262-400 c.i.d.
Designed for hydraulic flat tappet lifters.
Features 234 degrees intake and 244 degrees exhaust duration at .050 inch lift.
Suitable for jet boat and offshore high-performance applications.
Expect a rough idle characteristic of performance cams.
Not CARB approved; cannot ship to California.

⚠️ 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

COMP Cams is well-known for making performance camshafts and valvetrain components. This Xtreme Marine camshaft is built for Chevrolet Small Block engines that use hydraulic flat tappet lifters, offering a solid option for jet boats and offshore performance applications.

This camshaft features a 234/244 degree duration at .050 inch lift, designed to provide good off-shore high performance. It's intended for use with A or B impellers, and you can expect a rough idle, which is typical for cams of this performance level. It fits a wide range of Chevy Small Blocks from 1958 to 2002, including popular engines like the 350 and 400 cubic inch V8s found in vehicles such as the Chevrolet C10, Camaro, and Corvette.

It's important to confirm your engine uses a factory flat tappet setup, as many later model Small Blocks (especially from 1985 onwards) came with factory roller camshafts. Removing the intake or timing cover is the best way to be sure. This camshaft is not CARB approved and cannot be shipped to California.