Intake manifold runner flow testing
These pictures help explain flow path behavior in differing shaped
runners. This is an important consideration when modifying manifold
runners and even more so for the BBF's symetrical intake port
layout. Note that the short turn and long turn radii are not
necessarily on the horizontal. It depends on the flow path shape.
Link to Jim McFarlands flow article in
its entirety. This is a "Must" read