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This Supertech titanium retainer fits a 5.5mm valve stem and pairs with 6-degree spring M1007BE for Nissan RB25 Neo applications. It’s intended as a direct replacement retainer to secure specified springs and preserve correct seating during valvetrain servicing or rebuilds. Fitment is specific to the RB25 Neo configuration that uses the listed stem and spring geometry.
Supertech Titanium Retainer 5.5mm Stem 6 Degrees Spring M1007BE Nissan RB25 Neo
