What kind of idle can I expect with this camshaft?

This COMP Cams Magnum camshaft is designed for performance and will produce a noticeable, choppy idle. This is a common characteristic for camshafts with this duration and lift profile.

What other modifications are recommended when installing this camshaft?

For best results, it's recommended to pair this camshaft with an aftermarket torque converter with a stall speed of 2800 RPM or higher, headers, and appropriate rear-end gearing. You'll also want to ensure your engine has at least 9.5:1 static compression.

Does this camshaft fit all Chevrolet Small Block engines?

No, this camshaft is specifically for Chevrolet Gen 1 Small Block engines and does not fit LT1/LT4 engines or factory roller Small Blocks built from 1985 and newer. It also does not fit LS-based engines. You may need to inspect your engine to confirm if it has a factory roller or flat tappet setup.

COMP Cams Magnum Hydraulic Flat Cam 12-326-4

Name: COMP Cams Camshaft CS 286H-10
Brand: COMP Cams
Price: 320.45 USD
Availability: InStock

COMP Cams Camshaft CS 286H-10

$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 Magnum hydraulic flat tappet camshaft for Chevrolet Small Block Gen 1 engines. Offers improved performance with a choppy idle.

Key Features

Fits Chevrolet Gen 1 Small Block engines, including displacements from 262ci to 400ci.
Features a 236/236 duration at .050 lift for improved high-RPM power.
Requires a minimum of 9.5:1 static compression ratio for optimal performance.
Works best with an aftermarket torque converter rated at 2800+ RPM stall speed.
Designed for use with headers and appropriate rear-end gearing.
Offers a noticeable, choppy idle characteristic.

⚠️ 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

This COMP Cams Magnum camshaft features a 236/236 duration at .050 lift, a common specification for performance builds that want a noticeable idle chop and improved top-end power. It's designed for Chevrolet Gen 1 Small Block engines, fitting a wide range of displacements from 262ci up to 400ci, but it's important to note it's not for factory roller blocks or LT1/LT4 engines. For this camshaft to perform its best, you'll want at least 9.5:1 static compression and an aftermarket torque converter with a stall speed of 2800 RPM or higher, along with headers and appropriate rear-end gearing.

The Magnum series is a well-known option from COMP Cams, balancing performance gains with reasonable valvetrain wear. It works well with mild ratio rocker arms and traditional performance valve springs, making it a solid choice for engines looking for more power without being overly abusive. While it delivers excellent high-RPM power, the accompanying idle characteristics are described as choppy, which is typical for this type of performance camshaft.

When installing this camshaft, ensure your engine meets the compression and stall speed requirements. It's also worth checking if your specific 1955-1957 Chevrolet 265 engine requires an oiling groove on the 5th cam journal, as noted by the manufacturer. This camshaft is not CARB approved and cannot be shipped to California.