From Street Stock to Winston Cup, the three most important areas for engine performance improvements are cylinder heads, valvetrains, and intake manifolds. In particular, cylinder heads affect most ...

We have already discussed here a wide list of procedures you can do yourself on your Toyota VVTi engine, from removing the valve cover to the crankshaft. In this article, our focus will be on how to ...

Over the past few months, we've stated in numerous articles (including our tech feature on Grump's 331-inch Chevy) that the main reason for the horsepower gains enjoyed by many of the Modified and Pro ...

On average, a properly set-up engine can make about 2 horsepower for every 1 cfm of dry intake port airflow. However, that does not automatically translate to "bolt on better-flowing heads and make ...

New cylinder head designs are not something you see everyday. Even when something new does come out, it's normally adapted from something else, be it a race head or a more exotic engine. The trickle ...

Chrysler Group dealers are replacing malfunctioning cylinder heads on a small percentage of 3.6-liter Pentastar V6 engines. And a recent shortage of replacement heads means some customers have been ...

Revealed in April 2009 at the New York International Auto Show and the Jeep Safari in Moab, the 3.6-liter Pentastar V6 is a workhorse of an engine that continues to split opinion. On the one hand, ...