Supertech - Valve Locks single groove

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20 keepers required for intake and/or exhaust (40 required for a full engine, intake & exhaust)* Description Some Supertech performance valves feature “radial-style” single groove on the valve stem and require matching single groove valve keepers. Single groove valves are preferred for performance orientated and race engines as the top part of the groove provides a cushion for the lock and aids in valve stem protection against uncontrolled and excessive valve movement. In addition, the single groove design greatly extends valve stem life by restricting rotation of the valve preventing accelerated wear by excess movement caused by the factory triple groove design. 2 valve locks required per valve Engines Audi - R8 Audi - BHK Audi - BHF VW - APB VW - 2.7T Audi - APB Audi - 2.7T VW - AEB VW - 1.8T Audi - AEB VW - R32 VR6 VW - EA113 VW - EA888 Audi - R8 V8 VW - DAZA VW - TTRS-RS3 Audi - 2.5T FSI VW - 2.5T FSI Audi - TFSI Audi - EA888 Audi - EA113 VW - TFSI Audi - 1.8T Renault - F4RT 2.0LTS GM - Ecotec Z20LET BMW - N54 Turbo BMW - S54B32 BMW - S50B32 Euro Version BMW - M54 BMW - M52 BMW - S52 BMW - S50 BMW - M50 BMW - S42 BMW - N55 Turbo BMW - S55 Turbo BMW - B38B15 Vauxhall - Z20LET Opel - Z20LET Mini - B48 GM - Ecotec LSJ BMW - B58B30 BMW - B48 BMW - M42 BMW - B58B30 Mini - B38 Show more