I have seen those engines before. The ones I saw ran on nitromethane. That V8 sounds alot like my 2.5cc single cylinder T-MAXX funny stuff. U guys should check out OS engines' website, they have engines like that for BIG RC planes. (no V8s as yet, but awesome inlines and radials even a rotary!)

http://www.osengines.com/engines/airplane.html

-Chris