For clarification, the high-rise principle concerns the angle at which the intake manifold port (branch, runner, etc.) approaches the cylinder head inlet port. By bringing the centerline of the ...

Since the days of relieving flathead Fords, we've known about the advantage of porting. Grind those critical passages with the right touch, and airflow through the engine improves-and with more air ...

What’s the first thing you look at when checking out someone’s engine bay? Chances are the intake manifold is at the top of that list. The type of intake manifold can tell a lot about it; stock ...