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 ...

There was once a time when Desmodromic valve technology was cutting edge and a necessary competitive advantage for Ducati in racing. The Desmo head doesn't use a valve spring to return the valve to ...

Worldwide, Honda enthusiasts invest hundreds, if not thousands of dollars on their powerplants to extract the utmost in power and reliability. Whether they opt to keep their Honda naturally aspirated, ...

Drivers of 2005-06 Buick Rendezvous and Terraza, Chevy Uplander and Pontiac Montana SV6 minivans with 3.5-liter V6 engines may come into your store with a complaint of a stumble or hesitation at ...