A properly tuned engine is an incredible mix of components all moving in harmony. Air, fuel, and metal all working together to produce that precious magic we gearheads call torque. A critical factor ...

Roller rockers are not glorious parts. They look trick, but they live a pretty dismal life, working feverishly, always trying to keep things stable. Glory's one thing, but are they worth the cost?

Engine performance is like a complicated formula in which each individual part plays a role in the final answer. Some parts of the formula affect the final outcome more than others. The valvetrain ...