American publisher Charles Knight was not at all impressed with his new 1901 Knox ‘gasoline runabout’. Like some other cars of the era, its four-stroke engine relied on a single valve to permit both ...

For mild street engines, stock valve springs are more than adequate. But if you've screwed in a big bumpstick for strip-banging or banzai runnin', then pay attention. Our plan was simple: Install a ...

Bruiser ("Ground & Pound," October '09) seemed well at home in the upper rpm. A closer look revealed a less-than satisfactory issue with valve float and subsequently a loss in power. It's been known ...

They look harmless enough, but cams are some of the most complicated parts of your engine. In simple terms, cams are long, cylindrical-shaped shafts containing several irregular-shaped lobes that ...