i sold him this b16a with my DA9, it's a JDM EG6 b16a and they are either supertech or crower retainers (can't really remember), the head was shaved, and i've replaced the OEM headbolts about 1.5 years ago when i installed the head, the head was in a EK9 before which pull 121kw@front wheels with C cams. (b16a head, b16b block)