What kind of compression ratio is ideal for this camshaft?

This camshaft performs best when your engine has a static compression ratio of 9.5:1 or higher. It's designed to help bleed off some of that compression effectively.

What transmission and rear end gearing is recommended for this camshaft?

For optimal performance, especially for street use, it's recommended to pair this camshaft with a 4-speed transmission and a rear end gear ratio of 4.10 or lower (numerically higher).

Does this camshaft come with installation hardware?

This camshaft is sold individually and does not include installation hardware such as lifters, pushrods, or valve springs. It is recommended to use mild ratio rocker arms and traditional performance valve springs with this camshaft.

COMP Cams Camshaft 31-336-4 - Ford Small Block

Name: COMP Cams Camshaft FS 306S-10
Brand: COMP Cams
Price: 270.00 USD
Availability: InStock

COMP Cams Camshaft FS 306S-10

$270.00

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 camshaft for Ford Small Block engines. Improves high RPM power for performance builds.

Key Features

Fits Ford 221, 255, 260, 289, and 302 Small Block engines.
Designed for engines with 9.5:1+ static compression ratio.
Works best with aftermarket torque converters rated 4000+ RPM stall.
Improves high RPM power output.
Suitable for street use with appropriate supporting modifications.
Compatible with mild ratio rocker arms and traditional performance valve springs.

⚠️ 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

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

If you're looking to get more out of your Ford small block engine, especially one that's been rebuilt with higher compression, this COMP Cams Magnum camshaft is a solid option. It's designed to work well with static compression ratios of 9.5:1 or higher, and it pairs nicely with an aftermarket torque converter that has a stall speed of 4000 RPM or more. This camshaft focuses on delivering strong power up in the higher RPM range without putting excessive stress on your valve train components.

This particular grind, the FS 306S-10, is part of COMP Cams' well-known Magnum series. It's a popular choice for performance engines that are already set up with mild ratio rocker arms and traditional performance valve springs. While it offers a noticeable bump in performance over a stock camshaft, it's still built to be durable and not overly aggressive, making it suitable for street use when paired with the right supporting modifications like a 4.10 gear ratio or lower in a 4-speed transmission.

This camshaft fits a wide range of Ford vehicles, including popular models like the Ford F-150, Bronco, and various Fairlane and Torino models from the 1960s and 70s. It's a well-made component that can make a real difference in how your engine performs when you're really pushing it.