There are several broad rules of thumb that provide clues to whether increasing rocker-arm ratio will prove to be a performance boon with a given engine, cylinder head, and camshaft combination.

Depending on your budget, finding an affordable upgrade for your mill can be challenging and even a bit disappointing. That's not to say we all don't want to tear a motor down and start from scratch ...

One of the many great things about the small-block Chevy is its versatility. Think about it for a minute: the same basic powerplant has been used to power everything from a heavy-hauling farm truck ...

Any gearhead worth his or her salt knows that whether it's a SOHC, DOHC, or OHV engine, the camshaft is considered the brain of a four-cycle internal combustion power plant. The camshaft's profile ...

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 ...