Edelbrock 2.055 (30 degree back-cut) testing

David Vizard is someone I respect. But I don't believe everything that comes out of his mouth as gospel. He's been hustling a bit of snake oil lately.

Taking my statement about reversion a bit further. Reversion, being what it is, also goes back into the intake manifold. You could also argue that the back cut on the intake valve makes reversion easier too. It's not like it just stops at the intake valve.