Dynotec lifters incorporate the check-ball design as standard. This superior design means more accurate oil metering, allowing the lifter to perform better at higher RPM. As used in all high-performance lifters, Dynotec lifters come complete with race style retaining circlips as standard. This coupled with our unique check-ball design means that Dynotec lifters are essentially an anti-pump up lifter. The check-ball design also provides greater flow through the lifter than the flat washer set-up. Only the check-ball design can help to prevent rattly lifters due to foreign particles in the oil. BRAND: DYNOTEC ITEM: 8 DYNOTEC VALVE LIFTERS OE PART No: 13231-53J01  TYPE: HYD LASH ADJ ENGINE: NISSAN 2.0L 16V TURBO CODE: SR20DET   NOTES: INCLUDING VVT MODELS 08/1990 - 11/1995  N14 PULSAR    01/1991 - 10/1993  S13 SILVIA 10/1993 - 12/1998  S14 SILVIA 01/1999 - 09/2002  S15 SILVIA 01/1991 - 12/1998  RS13 180SX 10/1994 - 11/2000  S14 200SX 11/2000 - 08/2002  S15 200SX