The center 4 rods have problems. Even with these Eagle SIR rods you have to clean up a bit of the bolt hole boss that is at the extreme upper end of the rod big end. I used a bench grinder to perform this task, then I polished the grind area on the wire wheel. I placed the piston in a sock for the grinding, this keeps the piston clean. Once you finish grinding, clean the bearing and rod that was exposed, wipe it dry of the solvents and re-lube. Reinstall the rod and test for fit. Repeat this all 4 of the center rods.