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19b. We’ll close with one last word on flat-tappet cams. If you must run a flat-tappet cam (original 289 Hi-Po, race class rules, and so on), Comp Cams offers the ability to have any of its flat-tappet cams (hydraulic or solid) run through the company’s new in-house Pro-Plasma Nitriding service. This industry exclusive machine uses a patented pulsed nitrogen plasma process to infuse nitrogen ions into the cam, strengthening and hardening the metal surface on a molecular level.