The engines of yesteryear were pretty simple, with tappets clackity-clacking away on cam lobes, opening valves, and making a ruckus while doing it. Mechanical lifters were adequate for valve operation ...

Judge denies motion to sever GM lifter lawsuit, keeping AFM and DFM claims together after four-year delay. Plaintiffs face an uphill battle.

We may receive a commission on purchases made from links. There are many V6 and V8 engines that use camshafts located within the engine block and pushrods to activate overhead valves. In those engines ...

Camshaft technology is continually changing. From new lobe profiles to various forms of lobe placement, each manufacturer takes its own approach to modern performance. While flat-tappet grinds remain ...

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At the very least, tearing down, inspecting, and cleaning hydraulic lifters is good engine hygiene that can contribute to long service life in your classic car. It’s also a great way to inspect the ...

However, these numbers reflect all units sold, and not all of the models listed were equipped with engines susceptible to the GM lifter issue – for example, trucks equipped with the 3.0L I6 LZ0 ...

In a world without limits, camshaft designers have known for decades what profiles they'd like to grind. But real-world technological limitations-in terms of design feasibility, materials science, and ...

Q: I have a 1996 Ford Ranger that sat for about a year that I would like to fix up. Everything was okay with it before it sat. Now it has a rapping noise that I think is a stuck lifter. I changed the ...

A properly tuned engine is an incredible mix of components all moving in harmony. Air, fuel, and metal all working together to produce that precious magic we gearheads call torque. A critical factor ...