Supertech recommends using their valve seals when upgrading to their valves. These intake and exhaust valve seals are recommend when upgrading to the the Supertech valves.
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VS-H6.6E: 6.6mm Exhaust Valve stem seal. Viton. Honda LS - Mitsubishi reduced diam. / VS-H6.6I: 6.6mm Intake Valve stem seal / Polyacrylic. Honda LS - Mitsubishi reduced diam.