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Speed-O-Motive bases its heads on bare castings, which are machined before assembly. In our case, this meant taking a couple of thousandths off the surface of our 215cc Dart Iron Eagle Platinum heads. The heads were then assembled with Manley valves and seals, along with cam-matched Comp springs and valvetrain components. The Dart heads feature machined spring pockets, but S-O-M uses locators for improved durability.