I think He pushed that as a way to increase OL scavenge, and pick up port velo, w/o increasing the duration as much. That would supposedly reduce the reversion event enough to "trade off". This is really small cam street stuff basically, Dulcich tried the 30° routine as well, but as Vizard acknowledges the seat load needs to be increased to maintain a tight seal & control bounce...so now You're using more spring(drag) to do the same job. Lately, Vizard has been using a 39° seat for stuff that isn't all-out. Guess that's His compromise, I'll let Him spend His dyno time proving/disproving it, I'm sticking with 45° for what I'm doing.