X2I might be way off course here, but why are the Z bars on your lifters facing the water jackets?? Aren't they supposed to be facing the other way? When I built my first roller engine, I thought the Z bars were supposed to face the water jackets, but wouldn't fit without clearancing the block on all four corner cylinders! I asked around, and found that they were supposed to be installed facing inward, been that way for several thousand miles, with no problems. Just my thoughts.
Wayne SAWDOFF) Pearce