Last week I was flowing a set of plus 305cfm set of Speedmaster heads and I could hear some turbulence and see some rolling numbers starting. I finished the flow test and set the lift at .550 and started checking shortside airspeed where I figured the issue was. Speed numbers were great across the turn and I said hey wait a minute. I squeezed the rubber line where my pedo tube pushes on and bammmm, pegged my meter at 401fps. So I happened to have some spare line for my portable electronic Dwyer manometer and switched the lines out and all is good. So I figured if those lines were getting old it’s time to change them all. I mean it cost like 6.50 to do. I wish I had written the year I built this thing and had a ballpark idea of how many flow tests I’ve done with it. When I get caught up or possibly this Fall I gotta check the brushes on three of these motors but that’s to involved for now.