EGR valve spindle was the first company to champion the Pro Flo

Posted by zjautopartsLee on January 28th, 2016

EGR valve spindle was the first company to champion the Pro Flo shape that reduces the stem diameter in the bowl area. This reduced stem diameter can result in improved airflow and slightly reduced valve weight. Manley now offers this shape in the Street Flo, Pro Flo, and Race Flo series.

As with most things in life, it’s the details that make the difference. You might not think that a measly degree here or there could make more horsepower when it comes to a valve job, but there’s power in those angles.

Engines use valves to control airflow for both the intake and exhaust systems. While sealing cylinder pressure is also important, performance-engine builders know that proper angles employed on a valve job can have a tremendous effect on airflow. And we all know that airflow is the key to making power. Increase airflow past those seemingly insignificant valves and you’ll make more power. It’s that simple.

Since flow decreases anytime air is required to Valve seat, it makes sense to create the transition past the valves as seamless as possible. With that in mind, decades of race-engine builders have discovered that multi-angle valve jobs do the trick.