What type of lifters does this camshaft require?

This COMP Cams camshaft is designed to work with hydraulic flat tappet lifters. It's important to ensure your engine block has the correct provisions for flat tappet components before installation.

Will this camshaft work with my 1990s Chevy truck engine?

It fits many Chevrolet Small Blocks from 1958-2002, but compatibility depends on whether your specific truck engine uses flat tappet or roller lifters. Many trucks from the mid-80s onward switched to roller lifters, so you may need to remove the intake or timing cover to confirm.

What kind of idle can I expect with this camshaft?

This camshaft is designed for racing applications and will produce a rough idle and lower vacuum. It is not intended for street use where a smooth idle and higher vacuum are desired.

COMP Cams Hydraulic Flat Tappet Camshaft 12-520-5 for Chevy

Name: COMP Cams Camshaft CS 22/12 H6
Brand: COMP Cams
Price: 378.83 USD
Availability: InStock

COMP Cams Camshaft CS 22/12 H6

$378.83

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COMP Cams CS 22/12 H6 hydraulic flat tappet camshaft for 262-400 c.i.d. Chevy Small Blocks. Offers a rough idle and low vacuum.

Key Features

Fits 1958-2002 Chevrolet Small Block engines from 262-400 c.i.d.
Designed for oval track racing with a .400" lift limit.
Features 247 degrees intake duration and 255 degrees exhaust duration.
Utilizes hydraulic flat tappet lifters.
Produces a rough idle and low vacuum, characteristic of performance racing cams.
Not compatible with LT1/LT4 or factory roller Small Blocks from 1985 and newer.

⚠️ 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

This is the COMP Cams CS 22/12 H6 camshaft, a hydraulic flat tappet grind designed for a wide range of Chevrolet Small Block engines from 262 to 400 cubic inches, built between 1958 and 2002. It's specifically intended for oval track racing applications where a rough idle and lower vacuum are acceptable, fitting within a .400" lift rule. This camshaft is a solid option if you're building a classic Chevy engine for competition and need a camshaft that meets specific performance parameters for that style of racing.

The CS 22/12 H6 features a duration of 247 degrees on the intake and 255 degrees on the exhaust, with a lift of .400" on both sides. This particular grind is meant to be used with hydraulic flat tappet lifters, and it's important to confirm your engine's block is set up for flat tappet components, as many later model Small Blocks (especially from 1985 and newer) came factory-equipped with roller lifters. If your block has the provisions for a roller cam, you'll need to ensure you're using the correct lifters and potentially an installation kit if you're converting from a roller setup or vice-versa.

Keep in mind that this camshaft will produce a noticeable rough idle and lower vacuum readings, which is typical for aggressive performance grinds like this one. It's not designed for street use where smooth idling and high vacuum are desired. Always consult your engine's specific service manual or verify your block's configuration before installation to ensure proper component compatibility.