heres my setup, trail/play port, stock cylinders, noss head 19cc domes, +5 timing, 2 into 1 carb, t5 pipes, K&N.. i run 93 pump gas and its a fast mofo, i would be afraid to stretch my tune anymore on it, but it is safe right where its at.. so yes i have ran 19cc domes on pump gas, but it also depends on altitude, i am about 500 ft asv.