FoT, Just got my flow bench numbers today. The machine shop I work with uses a Superflow 600 tester. .100 43 cfm .200 80 .300 108 .400 134 .500 149.3 .550 153.7 .600 147.4 I know that these numbers can vary but I was pleased with our home work bench grinding effort. Allen Allen & Jody Washatko 1971 TR6 - Number 6