The attached snip from the intake valve listing may explain what you found. The exhaust valve listing is similar, with pre-1941 valves showing only a single groove What's the date code on your cylinder head. Maybe it's a 1940 or earlier. And the figure you looked at likely was as well. I know that I have disassembled one 216 head (a '51) and it definitely had o-ring seals on the valves. As I recall it had the bottom and top spring plates and keepers along with the seals.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
