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 intricacies of airflow dynamics through a cylinder head are some of the most difficult concepts to grasp in all of hot rodding. That made it the perfect topic to discuss in the inaugural ...

It's obvious that hot rod parts have evolved tremendously over the past 70 years or so. One of the best examples is the small-block Chevy cylinder head. A scant 30 years ago, the iron "fuelie" casting ...

Beneath that stern, intimidating glare and impressive stature is a man with few equals in the realm of cylinder head expertise. There are probably a few people who know more about cylinder heads than ...