Help with dampener ID

Thanks for all the responses. I had a vague recollection of seeing this dampener before on another 360 but just couldn't place it. There are no markings on it that I could see. The man who built this motor had an extremely quick Duster (for the time period) which he competed in the western divisionals, but, lets just say he tends to stay on the outer edges of mainstream thinking when it comes to his builds. I wouldn't be surprised to find it was a 340 dampener he had balanced the internals to or some other strange chit. As I had figured it's time for a new set up.