I also agree they are 2 piece. One way you can tell is to run a magnet down the stem. If it sticks to the stem, then suddenly doesn't stick anymore near the head, it is a 2 piece valve. Also 2 piece valves usually have a bulge in the stem where the head is friction welded to the stem. They make them 2 piece because that way they can use a very high heat alloy for the head, and combine it to a stem that can be a lot more wear resistant.
2 piece valves have no place in a performance engine. Had one destroy my 428.
__________________
Paul Carter
Carter Cryogenics
www.cartercryo.com
520-409-7236
Koerner Racing Engines
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520-294-5758
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