There's no doubt that the valvetrain is the most complex part of any racing engine. It's also pushed the hardest against some incredible stresses. Nextel Cup teams and some manufacturers are putting ...

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 ...

Three common combustion engine valvetrain designs are flathead, overhead valve (OHV), and overhead cam (OHC). Many older cars have engines with flathead or overhead valves, and these designs also tend ...