

Specifications
- Brand
- COMP Cams
- Part #
- 12-647-5
- UPC
- 036584015505

COMP Cams Camshaft CS 266Xo-8
$378.83
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COMP Cams CS 266Xo-8 solid flat tappet camshaft for Chevrolet Small Blocks. Improves performance for street and strip builds.
Key Features
- Fits Chevrolet Gen 1 Small Blocks including 262, 265, 267, 283, 302, 305, 307, 327, 350, and 400 cubic inch engines.
- Solid flat tappet design with 236 degrees intake duration and 238 degrees exhaust duration at .050 inch lift.
- Optimized for 327-358 c.i. engines with approximately 9:1 compression, using a 2-barrel carburetor and stock intake/headers.
- Designed for oval track racing and performance street applications.
- Requires verification for 1955-1957 Chevrolet 265 engines due to a specific oiling groove requirement on the rear journal.
- Does not fit LT1/LT4, factory roller small blocks from 1985 and newer, or LS-based engines.
⚠️ 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
Product Details
If you're looking to get more out of your Chevrolet Small Block engine, a camshaft upgrade like this COMP Cams CS 266Xo-8 can make a notable difference. This solid flat tappet camshaft is designed for engines in the 327 to 358 cubic inch range, with a compression ratio around 9:1, and works well with a 2-barrel carburetor and stock-style headers. It's a popular choice for those rebuilding or modifying engines for street performance or oval track use.
This camshaft features a 236 degrees of intake duration and 238 degrees of exhaust duration, measured at .050 inch lift. These specifications are chosen to provide improved airflow and cylinder filling, which translates to better power output, especially in the mid-to-upper RPM range. The solid lifter design means it requires more frequent adjustment than a hydraulic lifter cam, but it's often favored for its responsiveness and ability to achieve higher lift profiles. It's well-built for the demands of performance applications.
This camshaft fits a wide variety of Chevrolet Gen 1 Small Block engines, including popular displacements like the 350, 327, and 283. However, it's important to confirm your specific engine's configuration. It does not fit factory roller camshaft blocks from 1985 and newer, nor does it fit LS-based engines. For 1955-1957 models, a specific oiling groove is required on the rear journal, and this particular part number may not be compatible; please verify your block's needs.
Specifications
- Brand
- COMP Cams
- Manufacturer Part #
- 12-647-5
- UPC
- 036584015505
Frequently Asked Questions
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