340 Block Bored to 4.160????? Help

trigger_andy said
Never ever seen any calliper out by anything like this? You using ones out of Christmas crackers or something?

you'd be surprised how badly digital measuring devices can be out of spec. most of the time, its due to crappy programming, or someone has dropped them enough times to throw them off. .025 of an inch is enough to screw a lot of stuff up