I did one at a time, and kept the caps in their right spots.whats size is the bearings for? if there oversize such as .010, you have to have the crankshaft machined for it. defiantly have to use a lot of assembly lube. use plastiguage to measure tolerances as he said. did you put the caps on correctly. the mains have the numbers and an arrow cast into them pointing to the front. the rod caps are stamped to show which rod there for and you want the numbers to be on the same sides. did you make sure the nub on the bearings is in the groove of the caps?