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Originally Posted by nglitz
One thing no one's mentioned yet. Those clear plastic tubes in Fastlane's picture are to slide over the ends of the valves to allow the seals to slide over the keeper grooves without getting torn up. A little oil helps, too.
Be sure to take off the plastic slider befor re-assembling the spring retainer & keepers. Too easy to leave on. Guess how I know that. 
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The bearing area (top of the valve stem is the main culprid for tearing up new stem seal. Machinist will clean up most of the problems with the top of the valve stems but it is not machine work in the sense of quality. Mostly they de-burr the stem. It only takes one burr to cut a groovein a stem seal. The seal I bought for my 3.8 L engine came with the plastic sleeve. In the old days we used McDonald's straws. They were big enough for small block Chevy Valves.
Dan