What is a 4/7 swap camshaft and why would I want one?

A 4/7 swap camshaft changes the firing order of cylinders 4 and 7. This updated firing order can help smooth out engine operation, improve exhaust scavenging, and lead to more consistent power delivery, which is beneficial for racing applications.

What kind of oil and break-in procedure is needed for this camshaft?

This is a solid flat tappet camshaft, which requires a specific break-in procedure to prevent premature wear. You must use a break-in oil that contains adequate zinc (ZDDP) and follow the manufacturer's recommended procedure for initial engine startup and running.

Will this camshaft fit my 1955 Chevrolet 265 engine?

This specific part number (12-689-47) does not fit 1955-1957 Chevrolet engines that require an oiling groove on the rear journal. If your engine has this requirement, you will need to contact us to order a camshaft with the necessary oiling groove.

COMP Cams Oval Track Camshaft 12-689-47 | Chevrolet Small Bl

Name: COMP Cams Camshaft CS 47S 282Xos-6
Brand: COMP Cams
Price: 352.74 USD
Availability: InStock

COMP Cams Camshaft CS 47S 282Xos-6

$352.74

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

COMP Cams CS 47S 282Xos-6OT camshaft for Chevrolet Small Blocks. Oval track 4/7 swap solid flat tappet design for improved performance.

Key Features

Fits Chevrolet GEN 1 Small Blocks and a wide range of other vehicles.
Oval track 4/7 swap solid flat tappet camshaft.
Intake duration is 252 degrees at .050 inch lift; exhaust duration is 258 degrees at .050 inch lift.
Designed for 327-358 cubic inch engines with 12:1+ compression and a 4-barrel carburetor.
Features a 114-degree lobe separation angle.
Not compatible with factory roller camshaft blocks 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

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Product Details

If you're building a performance engine for oval track racing or a serious street machine, a camshaft swap is one of the most effective ways to change how your engine runs. This COMP Cams CS 47S 282Xos-6OT camshaft is designed for Chevrolet Small Block engines, specifically for applications needing a 4/7 cylinder firing order swap. This updated firing order can help smooth out the engine's power delivery and improve exhaust scavenging, which is crucial for racing performance. It's intended for engines with 327-358 cubic inches, a compression ratio of 12:1 or higher, and a good 4-barrel carburetor with quality intake and exhaust systems.

This camshaft features a solid flat tappet design, meaning it requires specific break-in procedures and oil additives to prevent premature wear. The specs are 252 degrees of intake duration and 258 degrees of exhaust duration at .050 inch lift, with a lobe separation of 114 degrees. This profile is well-suited for high-RPM operation and is a popular choice for oval track cars where consistent power and durability are key. It's important to note that this camshaft is not compatible with factory roller camshaft blocks, including most 1985 and newer Small Blocks, or LS-based engines. Always confirm your engine's configuration before ordering.

When installing this camshaft, remember that 1955-1957 Small Blocks require a specific oiling groove on the rear journal, which this particular part number does not have. If your early block requires this groove, you'll need to contact us for a different option. Proper break-in is critical for flat tappet camshafts; ensure you use a break-in oil and follow the manufacturer's recommended procedure to seat the lobes correctly.