Ok... I bought a '69 coupe a while ago and my ex-mechanic/motor-head neighbor diagnosed my windsor with a sticky exhaust valve that isn't closing properly. He tried pouring type f down the carb and that helped some. The next thing he suggested hooking up my windshield washer hose (filled with water) to my carburetor and while under load, push the wiper button. I have been trying to find more information on this method, but have not been able to find much, but what I did find said injecting water was a good method. Is this safe to do?