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The cylinder heads and the associated valvetrain components are a key to performance and reliability. The heads are CNC-ported Pro Comp castings that were hand-finished. The valves are hollow-stem Ferrea pieces in 2.125/1.625-inch sizes. Henderson extols the virtue of the tulip exhaust valve form. Note the fire slot in the quench area of the head. Henderson claims it helps reduce detonation and increases turbulence.