How do I know if my Chevrolet Small Block has a flat tappet or roller camshaft?

The best way to confirm is to remove the intake manifold or timing cover. Engines built from 1985 and newer, especially in performance applications, are more likely to have a factory roller camshaft. Trucks and SUVs sometimes retained flat tappet cams longer, into the mid-90s.

What does the '.322" lobe lift' specification mean for my engine?

This refers to how much the camshaft lobe lifts the valve. A .322" lobe lift is a specific measurement that is beneficial for racing classes with restrictions on maximum valve lift, often found in short track racing with stock rocker arms.

Does this camshaft fit my 1957 Chevrolet 265 engine?

This specific part number, 12-684-5, does not fit 1955-1957 Chevrolet 265 engines because they require an oiling groove on the rear journal. If your engine needs this groove, please contact us to arrange for a specially ordered camshaft.

COMP Cams CS 270L322 S7 Solid Flat Camshaft 12-684-5

Name: COMP Cams Camshaft CS 270L322 S7
Brand: COMP Cams
Price: 378.83 USD
Availability: InStock

COMP Cams Camshaft CS 270L322 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 270L322 S7 solid flat camshaft for Chevrolet Small Block Gen 1 engines. Offers improved performance for restricted racing classes.

Key Features

Fits Chevrolet Gen 1 Small Block engines including 262, 283, 305, 327, 350, and 400 displacements.
Solid flat tappet camshaft design.
Features .322" lobe lift, suitable for racing classes with lift restrictions.
Compatible with stock rocker arms and .480" or .500" lift rules.
Does not fit LT1/LT4 or 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

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Product Details

If you're working on a Chevrolet Gen 1 Small Block engine and looking for an improved camshaft, this COMP Cams CS 270L322 S7 solid flat tappet camshaft is a solid option. It's designed for applications with specific lift rules, like short track racing where there are restrictions on how much the valves can open. With a lobe lift of .322 inches, it works well with stock rocker arms and common lift limits of .480 or .500 inches.

This camshaft fits a wide range of Chevrolet Small Block engines, including popular displacements like the 262, 283, 305, 327, 350, and 400. It's important to note that this camshaft is for engines with flat tappet valvetrains. If your engine was built from 1985 or newer, especially in performance models like Camaros or Corvettes, it might have a factory roller camshaft, which this part will not fit. Always check your specific engine's configuration by removing the intake or timing cover to be sure.

For those working on very early engines, specifically 1955-1957 Chevrolet 265 models, there's a specific oiling groove requirement on the rear journal. This particular camshaft part number does not include that groove. If your early engine requires this groove, you'll need to contact us to arrange for a specially ordered camshaft.