

Specifications
- Brand
- COMP Cams
- Part #
- 12-852-9
- UPC
- 036584015741

COMP Cams Camshaft CS 300Rx-7
$604.45
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COMP Cams Oval Track Solid Roller Camshaft CS 300Rx-7OT for Chevrolet Small Block Gen 1 engines. Part# 12-852-9. Verified fitment. Fast shipping.
Key Features
- Fits Chevrolet Gen 1 Small Blocks including 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400 cubic inch engines.
- Oval Track 267/276 degree duration split with solid roller lifters.
- Designed for late model 430 cubic inch engines with good heads and light valves.
- Compatible with a wide range of GM vehicles from the 1980s and 1990s.
- Requires a flat tappet block; does not fit factory roller Small Blocks from 1985 and newer.
- Does not fit LS-based engines (LS1, LS2, LS3, 4.8, 5.3, 5.7, 6.0, 6.2).
⚠️ 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
This COMP Cams CS 300Rx-7 Oval Track Solid Roller Camshaft is designed for Chevrolet Gen 1 Small Block engines, specifically for late models around 430 cubic inches that have good cylinder heads and lighter valves. You'll receive the camshaft itself, ready for installation into your performance build. This camshaft is a popular choice for oval track racing applications where consistent performance and durability are key.
The CS 300Rx-7 features a 267/276 degree duration split with solid roller lifters, offering a noticeable bump in performance over stock camshafts. Its specifications are tailored for engines with upgraded cylinder heads and lighter valves, allowing it to breathe more freely and generate more power. COMP Cams is well-known for its camshafts, and this particular grind is built to withstand the demands of racing. It's important to note that this camshaft is intended for flat tappet blocks; if your engine was originally equipped with a factory roller camshaft (typically 1985 and newer), you'll need to confirm its configuration before installation. Early 1955-1957 models also require a specific oiling groove on the rear journal, which this particular part number does not include.
This camshaft fits a wide range of Chevrolet Gen 1 Small Block engines, including popular displacements like the 350, 400, and 327. It's also compatible with many other GM vehicles from the 80s and 90s, such as the Chevrolet C1500, Buick Roadmaster, and Cadillac Fleetwood. Always double-check your specific engine block's configuration to ensure proper fitment, especially regarding factory roller setups and the oiling groove for early models. This camshaft is not CARB approved and cannot be shipped to California.
Specifications
- Brand
- COMP Cams
- Manufacturer Part #
- 12-852-9
- UPC
- 036584015741
Frequently Asked Questions
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