Be sure to use some sort of device to hold the valve in place, like a piece of rope or better yet, air pressure.
I'd sugguest to keep the head gasket from loosing its seal, that you disassemble the rocker arm stanchions and bolt them back on with the head bolts. This will ensure that the HG isn't disturbed while you are working away on the valve seals.
Jim, I guess I can use one of the universal models? And also, can't I change the seals without removeing the the rocker assembly? I don't have a pic to look at right now, but I thought the rockers would slide out of the way.
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