What type of lifters does this camshaft require?

This COMP Cams camshaft is designed to work with hydraulic flat tappet lifters. It is not compatible with roller lifters or blocks that came factory-equipped with roller camshafts from 1985 and newer.

What kind of idle and vacuum can I expect with this camshaft?

This camshaft is designed for a rough idle and low vacuum output, typically under 10 inches of mercury. This characteristic is often desired for oval track racing applications.

Does this camshaft fit all Chevrolet Small Block engines?

It fits most Chevrolet Gen 1 Small Blocks from 262 to 400 cubic inches, including popular engines like the 350. However, it does not fit LT1/LT4 engines or factory roller small blocks built from 1985 and newer. You may need to check your specific block for compatibility, especially for 1955-1957 models.

COMP Cams CS 45/28 H6 Hydraulic Flat Tappet Camshaft 12-522-

Name: COMP Cams Camshaft CS 45/28 H6
Brand: COMP Cams
Price: 378.83 USD
Availability: InStock

COMP Cams Camshaft CS 45/28 H6

$378.83

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COMP Cams CS 45/28 H6 camshaft for Chevy Gen 1 Small Blocks. Designed for a rough idle and low vacuum, ideal for oval track racing.

Key Features

Fits 1958-2002 Chevrolet Gen 1 Small Block engines from 262-400 c.i.d.
Designed for hydraulic flat tappet lifters.
Features .450" lift on both intake and exhaust.
Intake duration at .050" lift is 242 degrees, exhaust duration is 255 degrees.
Has a rough idle and low vacuum output, suitable for oval track racing.
Note: Does not fit LT1/LT4 or factory roller small blocks from 1985 and newer.

⚠️ 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

If you're building a Chevrolet Gen 1 Small Block for oval track racing and need a camshaft that meets a .450" lift rule, this COMP Cams CS 45/28 H6 is a solid option. It's designed to work with hydraulic flat tappet lifters and will give you that characteristic rough idle and lower vacuum output that many racing applications prefer. This camshaft fits a wide range of Chevy Small Blocks from 262 to 400 cubic inches, including popular engines like the 350 and 305, found in vehicles from the 1950s through the early 2000s, such as Camaros, Corvettes, and many truck models.

This camshaft features a 242 degrees of intake duration and 255 degrees of exhaust duration at .050" lift, with a total lift of .450" on both intake and exhaust. The specific lobe separation angle helps create the rough idle and lower vacuum that can be beneficial for certain racing classes. It's important to confirm your engine's block type; this camshaft is for blocks that use flat tappet lifters and does not fit factory roller camshaft blocks from 1985 and newer, or the LS-based engines. If your 1955-1957 engine requires oiling on the 5th cam journal, you'll need to check for the groove.