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Video: Performing a Cam Swap on a 454 Big Block Chevy

Discover how adding a more-aggressive camshaft to a factory engine can dramatically increase power, when the good people at COMP Cams show you how to perform a cam swap in a massive big block Chevy.

Using a 454-cubic-inch V8 L29 7.4-liter Gen. VI motor, which originally came equipped in 1996-’99 full-size Chevrolet and General Motors trucks, the crew chose a COMP Cams Xtreme Energy Camshaft — a cam with an aggressive profile that required them to upgrade the valve springs to accommodate it (which we will share in next week’s video post).

In this cam swap video, you will be guided through the process of turning the engine to Top Dead Center (TDC), and through the tear-down process of removing the valve cover, rocker arms, pushrods, ignition and induction components, and more.

The video provides tips on how to position the timing sprocket before removing the timing chain, and then shows you how to remove the camshaft and replace it with the new one.

Thanks to the magic of video editing, getting the engine back together takes almost no time at all, and you can watch the dyno charts as the upgraded engine — despite being predominantly factory — responds to the new cam.

The swap generated an additional 55 horsepower and 30 foot-pounds of torque.

See for yourself.

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3 Comments

  1. Pingback: Video: Upgrading Valve Springs to Accommodate Cam Swap - OnAllCylinders

  2. Nathan Young says:

    I have an 89 5.7 that I put an edelbrock performance intake 305 heads and would like to know what size cam to get without having to get new springs just a mild race cam I’m waiting on headers as well. No bro has been done yet heads and intake are the only added parts so far any info would be great. Thanks oh this 89 engine is in my 82 chevy truck th350 transmission

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