The rules in some racing classes restrict competitors to running hydraulic valve lifters. Cheaters have been known to run hydraulic lifters on a mechanical (solid) cam profile. Solid cam profiles ...

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 ...

There are very few sounds sweeter to a gearhead than a small-block spinning past 8,000 rpm. For anyone who appreciates internal-combustion engines and horsepower, a race engine spinning at high rpm is ...

COMP Cams Explains the Pros and Cons of Solid, Hydraulic, Flat-Tappet, and Roller Cams, and the Advanced Technology that makes them all Work. With horsepower seemingly growing on trees these days, ...

One of the most defining aspects of a real performance car is a performance cam, a stick that raises lift, adds duration, and gives the engine a distinctive idle that sounds really cool. But sometimes ...

Add Yahoo as a preferred source to see more of our stories on Google. The engines of yesteryear were pretty simple, with tappets clackity-clacking away on cam lobes, opening valves, and making a ...