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Brian Crower 6.5mm valve stem keepers/locks are specified for Mitsubishi 4G63 and Evolution applications and are made to fit BC2100-style retainers. These stem keepers secure the valve assembly by locking retainers in place and are intended for valvetrain rebuilds or upgrades where correct keeper sizing and compatibility with BC2100 retainers is required for reliable engine operation.
Brian Crower Mitsubishi 4G63/Evo 6.5mm Stem Keepers/Locks (fits BC2100 Retainers)
