Yes...but those are power valves that give the engine variable exhaust port dimensions
The exhaust valves I was refering to were tried on gasoline turbo two strokes and used to completely shut the exhaust port in order to prevent blow by
I was ref. two stroke diesel 6-71's that use a blower feed by a turbo (later gen. versions) to scavenge exhaust gasses and have two to four poppet type valves per cylnder and yes power valves for non diesel.
side note: 6-71= 6 cyl. @ 71 CU.IN. each.
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