Thats a better answer than "NOW TO AIR PRESSURE ON CARB PLATE IS A HOLE LOAD OF Sh%^ " and I never said I did not believe you. We are sharing what works for us. I have checked pop off pressure even on older carbs and never the same but the engine run fine for me using the tub run to the inside of the body. So what is the correct pop off pressure? If this is so critical why do the engine manufactures set this when they hand build the motor (like DA).