Ok. I am a mid-pack, on a great day top 10 B class racer in the Iowa series. I am going to race the Mo GNCC, my first and prolly only GNCC. I am wondering what the difference is between the Open B class and the 4 Stroke B class? Which is faster, which has more entrants usually, and how do they compare with the Junior class? I need advice on which class to run. I know I will not have a prayer at a decent finish in any of them, and I don't care, but just want to make life as easy on me as it can be. Any advice will be appreciated.