This is just part of the famous Pratt & Whitney 28-cylinder
Major R-4360. It was used on the Spruce Goose, the B-36, &
Stratocruiser, & others such as "Reno Racers," in which form
out 4,500 hp! It was only
at 2,800 hp at 2,700 rpm. Shot at the Owl's Head Museum.