[gamiller]

i didn't see it said here yet, so:

When Extrude Hone offered to "max out" the UIM, they enlarged the passages as much as possible without weakening the UIM. The SVT UIM also underwent processing by Extrude Hone but not as thoroughly. You might hear talk of the SVT UIM as being "dual honed" or "single honed." This refers to the number of times the part was believed to have passed through the honing process. In short, a UIM that was honed to the max will outflow any other.