if you are talking about small block chevys, then yes they have an o ring seal on the second groove of the valve stem just below the keepers. I built cylinder heads for a few years and we ran small block ford umbrella seals because the chevy o rings suck.
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Guy
68 Camaro, LS1 T56, DSE Speed Kit 2, DSE Quadralink, DSE Mini Tub, Forgelines, Vintage Air, Dakota Digital, GM Tilt Column, Corbeau Seats
2012 Dodge 3500 4x4 6.7L Diesel CCSB
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