You have likely heard of variable valve timing by one of the names manufacturers have for the system, such as VVT-i or VTEC. So what is it and what does it do?

In this tech article HOT ROD provides a guide to variable valve timing (VVT) technology which can be found in most late-model performance engines and we explain how hot rodders can get the most ...

Check out this article on variable valve timing systems from Honda's VTEC to Toyota's VVT-i and Nissan's CVTC, from Super Street Magazine.

We test GM's new variable valve timing system and get dozens of horsepower with not sacrificing and torque. Only at www.hotrod.com, the official website for Hot Rod Magazine.