I just finished installing a TFS Stage 1 cam in my '92 Mustang. When I tried to install the FMS roller rockers, I ended up using shims. The problem is, I need to get 2 shim kits to get the right preload. I thought I remember reading that you cam only go to .090 when using shims. So this got me thinking. I tore down the rocker system, and decided to measure the thickness of the shims. I was under the assumption that the 2 different sized shims were .030 and .060 thick. When I measured the shims, the thin ones are .020 and the thick ones are .035. So now I am a little confused. All but one of the intake rockers need one.020 shim, and two .035 shims. The exhaust rockers need one .020 shim and one .035 shim. The biggest amount of shims totals .090. I examined each valve tip for roller wear before I installed the shims, and I tried the marker method after I used the shims. The marks are a little bit toward the intake side, but the wear pattern is tight. slightly under the .080 range. Would this setup with shims be okay, or do I need different length pushrods?