My domes are shelf domes,, i can make Abt 3 passes and it blows the plugs out,, it doesn't lay over at all,, and my motor is 4mil drag ported stock cylinder on alky with 38mm keihin carbs timing set at 9 degrees,,, it doesn't drop out of the powerband,, and it doesnt rev up by itself after I pull the clutch in...and my left cylinder usually runs Abt 120 and the right side is Abt 85 to 90