The Polyspheric or Poly engines were V8 engines produced by Chrysler from 1955 to 1958 as lower-cost alternatives to the Hemi engines. These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons.
I saw a dual plug hemi engine there, difficult to get a good look see, but it sure looked like an early hemi, they are obviously visibly different.
