Flat tappet cams can be damaged by using modern engine oils that lack zinc and associated anti-scuff additives. Zinc can damage catalytic converters, so it's slowly been eliminated in modern engine ...

Adjust rocker arms frequently—or not at all? Rev to the moon—or stop at the smog layer? These are the eternal questions that have plagued hot rodders trying to decide whether to purchase a mechanical ...

With so many of our discussions lately revolving around the valvetrain, we thought you might like to finally learn how to get the best performance from yours. High-performance valvetrains can take ...