The 13b engine from Mazda uses 4 dowel pins that are very brittle and provide more "slop" or "flex" in the engine.
These pins are precision ground for tighter diameter and straightness tolerance. Each end is beveled for installation aid. After the hardening process the pins are finished to a 10 rms micron finished OD. Being one pin rather than two in the engine, rigidity is increased.
These bars retain a softer steel core but offer the tough exterior with hardening layer; a .1mm deep hardened exterior provides a smooth, durable, long-term finish. Furthermore, the exterior is so hard that they cannot be cut with a tempered/hardened band-saw blade! These are cut for the factory irons and rotor housings, if you have lapped irons please contact us; the length of these units are crucial!
Please call our office at (845) 332-8652 or message us for further questions.