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TFS offers the 4.6L Twisted Wedge heads in two different combustion chamber volumes: 38 cc and 44 cc. We chose the 44cc chambers for our 5.0L stroker. When combined with flat-top pistons, the result is a static compression ratio of just over 11.0:1. The new heads also featured a 1.84/1.45, stainless steel valve package.