Customers have voiced complaints about GM lifter failures across a wide range of V8-powered vehicles. Which leads us to ask - ...

Automotive engines rely on valves to let the fuel-air mixture in and exhaust out, and most modern pushrod and overhead cam engines use lifters to open and close the valves. While the original ...

Noise is produced when the cam strikes the valve to lift it, and also when the spring ... they are unreliable at high engine speeds, and the “timing,” or opening and closing of the valves ...