What is a 4/7 swap camshaft and why is it used?

A 4/7 swap camshaft repositions the firing order of cylinders 4 and 7. This change helps to smooth out the engine's power pulses, leading to improved valve timing accuracy and a more consistent power delivery, especially at higher RPMs.

Does this camshaft fit my 1955 Chevrolet 265 engine?

This specific part number does not fit 1955-1957 Chevrolet engines that require an oiling groove in the rear journal. If your engine has this requirement, please contact us to discuss alternative options.

What compression ratio and engine size is this camshaft designed for?

This camshaft is intended for engines between 327 and 358 cubic inches with a compression ratio of 11:1 or higher. It is optimized for use with a 2-barrel carburetor and good intake and exhaust components.

COMP Cams CS 47S 278Xo-6 Oval Track Camshaft 12-688-47

Name: COMP Cams Camshaft CS 47S 278Xo-6
Brand: COMP Cams
SKU: comp-cams-comp-cams-camshaft-cs-47s-278xo-6-t14-4390378
Price: 352.74 USD
Availability: BackOrder

COMP Cams Camshaft CS 47S 278Xo-6

$352.74

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 CS 47S 278Xo-6 camshaft for Chevrolet Small Block Gen 1 engines. Improves performance for oval track racing.

Key Features

Fits Chevrolet Gen 1 Small Block engines.
Oval Track 4/7 Swap solid flat tappet camshaft.
Intake duration: 248 degrees at .050" lift.
Exhaust duration: 250 degrees at .050" lift.
Designed for 327-358 cubic inch engines with 11:1+ compression.
Suitable for 2-barrel carburetor setups with good intake and exhaust.

⚠️ 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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Will this fit your vehicle?

Product Details

This COMP Cams CS 47S 278Xo-6 camshaft is designed for Chevrolet Small Block Gen 1 engines, specifically for oval track applications. It's a solid flat tappet camshaft featuring a 4/7 swap design, which helps improve valve timing accuracy and overall engine performance. This camshaft is intended for engines with 327 to 358 cubic inches, requiring 11:1 or higher compression, and works well with a 2-barrel carburetor setup paired with good intake and exhaust systems.

The CS 47S 278Xo-6 camshaft has a duration of 248 degrees on the intake and 250 degrees on the exhaust, measured at .050 inch lift. This profile is well-suited for engines that see consistent high RPM use, common in oval track racing. COMP Cams is known for well-built engine components, and this camshaft is no exception, offering a solid option for racers looking to optimize their engine's powerband. Keep in mind that engines from 1955-1957 require a specific oiling groove on the rear journal, and this particular part number does not include it; please contact us if your application requires this feature.

This camshaft fits a wide range of Chevrolet Gen 1 Small Block engines, including popular displacements like the 350, 327, and 305. It is important to verify your engine's configuration, as it does not fit LT1/LT4 or factory roller small blocks from 1985 and newer. Many trucks and SUVs retained flat tappet cams into the mid-90s, so checking your specific vehicle is recommended.