Noisy tappets (also known as hydraulic lifters) are relatively common on engines that have done their fair share of work. By using oil pressure generated from the engine’s oil pump, the hydraulic ...

A lot of these cars have a life of short runs from cold and are highly prone to condensation inside the engine (sludge under the oil filler cap). As a result the hydraulic tappets can't pump up. An ...

For the last several years, many engine builders and individual hotrodders have experienced a raft of seemingly unexplained flat-tappetcamshaft lobe failures. As one engine builder puts it, "I've ...