Four-stroke engines, which make up 99% of vehicles on the road, rely on a system for managing air intake, compression, ...

Does your engine need a valve adjustment? It depends on the age, condition and brand of vehicle you’re driving. Due to the popularization of roller-follower valve train designs that reduce friction ...

At the end of the day, an internal combustion engine is just an air pump. Proper airflow in and out of the engine is thus ...

From Street Stock to Winston Cup, the three most important areas for engine performance improvements are cylinder heads, valvetrains, and intake manifolds. In particular, cylinder heads affect most ...