FWIW,
I've got maybe three or four VF .46s with Randy's original AAC P&L sets and they are pretty much THE standard by which I judged any other engines I used back when I was competing regularly. I've since gone back to sport flying a couple times a year with my old 1986 Nats champ Citation V which now has one up front and marvel yet again at the effortlessly consistent power it provides. I'd be interested in why he's opting to switch to pure ABC versions.
Shoot, I'm just glad he hasn't abandoned "real" stunt and gone to offering electric razor "motors" in VF plumage!!!!
Ted