A class action lawsuit filed against GM over alleged faulty lifters in certain V8 engines has still not received class action ...

Things just keep stalling, making plaintiffs and lawyers give up after years of waiting. General Motors isn't complaining.

A few days ago, we published a report highlighting the valve lifter issues some General Motors customers were experiencing in certain vehicles equipped with either its 5.3L V8 L84 gasoline engine or 6 ...

A small gap with big importance in the performance and health of an engine - here's everything you need to know.

General Motors's Active Fuel Management (AFM) technology utilizes hydraulic valves, solenoids, and advanced software to shut down half of the cylinders in a V8 or V6 engine to save fuel. The system ...

March 30, 2007 Over the last century of automobile development, we have seen an enormous range of valve actuation technologies, ranging from pushrod, through single then double overhead camshafts, ...

From the archives: The beauty of hydraulic lifters is that they self-compensate for valvetrain clearances, doing away with the need for valvetrain adjustment. To celebrate HOT ROD's 75th anniversary, ...

Editor's note: I met Jack Rhoads in 1967 when his father, James, conceived of a then-revolutionary way to vary valve timing as a function of engine speed. Today the concept is as valid as it was back ...