I don't think your measuring wrong. I would expect a .002-.005 error with a cheap crappy set of calipers. heck even the calipers I've used that were from harbor freight were within .002. the block dimension seems to measure ok at 5.12(0) probably missing that last significant digit but you're in the ball park. if the caps actually measure 5.14(0) you need another set of caps. that's a ton of squeeze to put on the block and the caps. and if your machine shop crammed them in there, find another shop to correct their work.