This valve guide is an internal component of an engine's cylinder head. Automotive databases show its exact dimensions: an outer diameter of 13.21 mm and an inner diameter of 8.02 mm. These specifications are critical for a precise fit and proper engine function, including oil control and heat dissipation.
: The identifier often appears in reference to G1 NW 25 connection standards used in these industrial systems. 2. Automotive and Heavy Equipment 011814-525