Hey, I wasn't suggesting actually using an air "chisel", but it is satisfying to learn the trivia. I ordered several valve guides in increments of .001, including standard just so I can get the fit I like.

Some useful (I think) advice on installing seals. The rubber ones are on the exhaust and just push on by hand and they're necked down before the keeper groove so you don't need to use an install shield. The teflon ones are tighter (because of suction?) and can be damaged by passing over the keeper groove. I hit the groove lightly with a stone to take the burr off, using a paper towel to catch any unseen bits of abrasive. Then I pulled the plastic sleeve "install" shield through the seal with a pair of needle nose until the end of the shield cleared the upper edge of the seal. Next I pushed the lower part of the shield over the stem just past the keeper groove, and carefully slid the seal past the groove, where the danger of damage is greatest, using the pliers to keep the shield from dragging down with it. Then I pulled out the shield. The seal takes quite a bit of pressure so I used the spring retainer turned upside down to give me more surface area. Just take care it doesn't "tilt" at the moment it pops on.
The valve "shims" have a different wear pattern if turned 180 degrees so mark them on one side( I like the "outside") with a sharpie pen so you don't get them turned around. Use a magnet to help with the keepers going out and use assembly grease on the keepers when you install them so they'll stay in place.

Easy as pi.

Basil