by jhooper/HRE » September 16th, 2014, 12:25 pm
Greg,
1- You can use any of the 34mm carbs that came with the engine BUT I am not sure if you would be allowed in Pro-Champ with anything other than the 34mm roundslide.
2- You can use any pipes, just like Champ.
3- You can either use the stock exhaust valve setup or you can block them open, I don't think you would be allowed to interchange valves, servos or any other exhaust valve controls.