Four-stroke engines, which make up 99% of vehicles on the road, rely on a system for managing air intake, compression, ...

An engine's valvesprings play a critical role in its performance, yet those incorrectly chosen for a given application can cause hobbyists to unknowingly point blame in another direction if an engine ...

We're always on the lookout for new stuff, so when information on Comp Cams dual conical valve springs came across our desk, we were eager to take a look. Comp introduced these dual conical springs in ...

The scenario goes something like this. Our LS3 used to rev freely and make power all the way up through 6,800 rpm, but now it struggles to get to 6,000 and power is definitely down. After a thorough ...

In the pre-LS era, a typical small-block-powered street car would rev willingly to around 5,000 rpm. You could assemble a cam package for it—even using heavy components—and you probably wouldn't have ...

Valves or poppet valves, controlthe inflow and outflow of air inside thecylinder for burning fuel and powering thevehicle. Valves are operated by the camshaftsplaced above them. Valves sit in ...

The 5-valve engine—a short but intense era born from 5 valves per cylinderWhen looking at car or motorcycle engines, the term ...