OK the new motor is long blocked " finally" and I was checking PR length and just now notice that the stems are lower than the retainer so as you guessed by now the rocker hits the retainer . Grinding the rocker is not an option. So I am thinking -.050 keepers and lash caps problem solved . In the past I have used +.050 to gain clearance and set them side by side to stockers and the protrusions where located at the same heights so I thought that the +.050's must be thinner to let the retainer ride higher on the stem ? So my question is all three keepers set side by side how could you tell which is which ?