DCutshaw94
New member
Hello everyone, as I read through the 2014 BSP rules I saw that the thickness of the retainers has changed to -.005" from last year, my question for everyone is, which do you prefer, thicker retainers or thinner retainers? Now that we have the ability to shim the valve springs I foresee this as being more important than it was last year. I build all my own motors and one thing I have never quite wrapped my head around was how the thickness of the retainers really affected things.