In racing, the valvetrain is one of the most highly stressed engine systems. High valve lift, high engine speed, and high spring pressures exponentially increase their demands on the lifters, pushrods ...

An engine that just doesn't perform as it should at high speed on the dyno or racetrack can induce a series of checks that usually first includes measuring the pressure and volume of the fuel being ...

Rocker arms made of different materials — like steel or aluminum — can offer separate drawbacks and advantages based directly on the differences between those materials. We'll get into the details ...

Any gearhead worth his or her salt knows that whether it's a SOHC, DOHC, or OHV engine, the camshaft is considered the brain of a four-cycle internal combustion power plant. The camshaft's profile ...

Overhead cams are a more efficient method of actuating the valves than with a pushrod, but someone in Detroit never got the memo. And thank goodness they didn't. With production pushrod mills turning ...

The rocker arms transfer a displacement from the camshaft to the valves. The camshaft has lobes that contact push rods and move them up and down in a periodic manner. The other end of the push rods ...

A recently filed patent details a new GM cylinder deactivation system that appears to be heading to the next-gen V8 engines coming in the 2027. This new GM cylinder deactivation system might replace ...