I got a 440 block back from the machine shop on Friday, and all of the work looked really good except for the fact that the no. 2 bore had only been 1/2 chamfered. Half of the bore has been chamfered, and the other half still has sharp edges.
The machinist is over 100 miles away, so I don't really feel like driving all the way back just so he can fix something that I can easily fix myself.
I figured I could just go over the unchamfered area with a file and it'd be no problem.
My question is this: I'd always thought that bores were chamfered to keep the edges from getting too hot and causing detonation. A friend told me that he'd always assumed that it was for ease of piston installation. Who's right on this one?
Thanks in advance.

chamfering sharp edges(on pistons for example) is to hinder preignition but chamfering the bore is for easing ring installation(just keeps the edge from catching the ring) & it should be very slight). Yes you can chamfer the rest of the bore(carefully) with the right size/grit of file & file from the inside to the outside. Sounds like the shop got sidetracked then forgot about it & since they didn't give the block a final going over before it went out the door they missed it which doesn't bode well for that shop being meticulous & would make me uncomfortable with giving them any more of my business.