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One thing is for certain: Chances are, if you know anyone with a Chevrolet that makes any decent power it has an aftermarket camshaft. Cams make the notorious chopping sound that muscle car guys adore, but are an integral piece of how the pushrod LS engine works. "What does a camshaft do, and why do I need one?" In the LS engines, the camshaft presses on a pushrod, transferring motion to the top of the engine, where a rocker opens the intake and exhaust valves. Upgrading to a higher lift camshaft helps the engine breathe in and expel more air,...

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