In the 1100 Runabout class they mostly run Konig or Koney 700 cc engines, maybe a few 800+ engines and a VRP or Rossi. There is a Merc 6 cylinder run of Alky which can beat the Konigs. I believe it is a 66 ci. out of Calif. If your 666 isset up it should be competitive. The class is run in Constantine, Mich. and at the Pro Nationals. Too bad there are not more races for this class, It is a real crowd pleasure. ....Bob N-96