During one of our never-ending technical discussions, Jim Grubbs at Jim Grubbs Motorsports (JGM) suggested that we take a look at the flow difference between 30- and 45-degree valve seats. While ...

The real world, where most of us except for a lucky few Winston Cup teams exist, can often be a painful place to live. Money is real and quite often difficult to come by. That fact puts a crimp on how ...

Explore the 4-valve revolution that maximized cylinder head airflow and set a high-revving benchmark that engine builders ...