The debate over the optimum rocker arm ratio to use has dragged on probably since the invention of the pushrod V-8. Even though Chevrolet made the decision easy for us when it engineered the original ...

Q: I have a '74 Ford Maverick sedan that I built a mild 306 for. It has 9.5:1 compression, ported and polished factory heads, and a cam with 276/281 degrees advertised duration and 0.471-inch valve ...

Would you believe us if we told you that you could put 15-17 more horsepower to the wheels with rocker arms? We were a little skeptical until we soaked up the complete details on how possible this ...

Valve covers with drip rails came stock on most high-performance big-block engines back in the classic muscle-car era, but started going away by the early 1970s during the dismal smog era when cams ...

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 ...

A recently filed patent details a new GM cylinder deactivation system that appears to be heading to the next-gen V8 engines ...

Can roller rocker arms actually help add horsepower? The mechanically savvy will likely consider that question and say: “If you have more lift, and open the valves more, then you’ll make more power.