The following charts reveal the flow bench data collected on a Super Flow bench at 28 inches of water depression for a typical three-angle valve job and then Traco's enhanced low-and mid-lift flow ...

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 ...