How do I know if my engine has a flat tappet valvetrain or a factory roller?

You'll need to remove the intake manifold or the timing cover to visually inspect the camshaft and lifters. If you see separate roller lifters and a camshaft with roller followers, it's a roller setup. If the lifters are solid and the camshaft has simple lobes, it's a flat tappet design.

Will this camshaft fit my 1986 Chevrolet Corvette?

This camshaft is designed for flat tappet engines and does not fit factory roller Small Blocks built from 1985 and newer. Many Corvettes from 1984 onward received roller camshafts, so you would need to confirm your specific engine's configuration.

What is the benefit of the .312" lobe lift?

The .312" lobe lift is a specific design choice that helps keep the camshaft within lift restrictions often found at certain racing venues. This allows for improved high-RPM performance without exceeding the maximum allowable lift rules.

COMP Cams CS 274L312 S7 Solid Flat Camshaft 12-683-5

Name: COMP Cams Camshaft CS 274L312 S7
Brand: COMP Cams
Price: 378.83 USD
Availability: InStock

COMP Cams Camshaft CS 274L312 S7

$378.83

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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 274L312 S7 solid flat camshaft for Chevrolet Small Block engines. Offers improved high-RPM performance with .312" lobe lift.

Key Features

Fits Chevrolet GEN 1 Small Blocks from 262 to 400 cubic inches.
Features .312" lobe lift, suitable for tracks with lift restrictions.
Offers 248 degrees intake and 252 degrees exhaust duration at .050" lift.
Designed for engines with a flat tappet valvetrain.
Not compatible with LS-based engines or 1985+ factory roller Small Blocks.
Does not fit 1955-1957 SBC engines requiring a rear journal oiling groove.

⚠️ 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

With a .312" lobe lift, this COMP Cams CS 274L312 S7 solid flat camshaft is built for higher RPM operation, especially useful when you're running at tracks with lift restrictions that cap out around .480" or .500". This camshaft is designed for Chevrolet Small Block GEN 1 engines, covering a wide range of displacements from 262 up to 400 cubic inches. It's a solid option for many classic Bowtie builds, including popular models like the Chevrolet Camaro, Corvette, and C10 trucks from the 1980s and early 1990s.

This camshaft features a 248 degrees intake duration and 252 degrees exhaust duration at .050" lift, making it a popular choice for those looking to wake up their engine's performance. It's important to note that this camshaft is intended for engines with a flat tappet valvetrain. If your engine was built from 1985 onward, especially in performance models like Camaros and Corvettes, GM began phasing in roller camshafts. To be sure, you'll need to check your specific engine by removing the intake or timing cover to confirm if it's a factory roller or a flat tappet design. This camshaft will not fit LS-based engines or the specific 1955-1957 SBC engines that require an oiling groove on the rear journal.