What is the main benefit of the nitrided surface treatment on this camshaft?

The nitrided surface treatment on this camshaft significantly improves wear resistance. This helps to extend the life of the cam lobes and the lifters, ensuring more consistent performance over time.

Does this camshaft come with lifters or other valvetrain components?

This product listing is for the camshaft only. Lifters, valve springs, retainers, and other valvetrain components are sold separately and should be chosen to match the camshaft's specifications for optimal performance and reliability.

How can I tell if my Chevrolet Small Block has a flat tappet or roller camshaft?

The easiest way to confirm is by removing the intake manifold or timing cover. If you see lifters with a pushrod socket and a flat bottom that rides on the cam lobe, it's a flat tappet. Roller lifters are typically taller and have a wheel on the bottom that rolls on the cam lobe.

COMP Cams CS XM 278H Hydraulic Flat Cam 12-244-20

Name: COMP Cams Nitrided Camshaft CS XM 278H
Brand: COMP Cams
SKU: comp-cams-comp-cams-nitrided-camshaft-cs-xm-278h-t14-4390146
Price: 467.89 USD
Availability: BackOrder

COMP Cams Nitrided Camshaft CS XM 278H

$467.89

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 CS XM 278H hydraulic flat tappet camshaft for Chevrolet Small Block 262-400 engines. Improves performance for classic V8s.

Key Features

Fits Chevrolet GEN 1 Small Blocks 262-400ci, including many 1990s trucks and SUVs.
Features a nitrided surface treatment for improved wear resistance and durability.
Hydraulic flat tappet design for ease of installation and maintenance.
Intake duration of 234 degrees and exhaust duration of 244 degrees at .050 lift.
Designed to improve mid-range torque and overall engine performance.
COMP Cams part number 12-244-20.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

This product is a COMP Cams Nitrided Camshaft, specifically the CS XM 278H model. It's a hydraulic flat tappet camshaft designed for Chevrolet Small Block engines ranging from 262 to 400 cubic inches. This camshaft is built with a nitrided surface treatment, which helps to improve wear resistance and durability for the cam lobes and lifters over time.

The CS XM 278H features a 234/244 degree intake/exhaust duration at .050 lift, making it a popular choice for builders looking for a noticeable improvement in power and torque, especially in the mid-range. It's well-suited for applications like street rods, muscle cars, and marine use where a strong, reliable power band is desired. While it fits a wide range of Chevrolet Small Blocks, it's important to confirm your specific engine uses a flat tappet setup, as many later models (1985+) came with factory roller cams.

This camshaft is a solid option for those rebuilding or upgrading their classic Chevrolet V8. It's designed to work with many common Small Block configurations, but always double-check your engine's specific requirements, especially regarding the oiling groove on the 5th journal for earlier 265ci engines.