Designed for the increased duties of aftermarket camshafts and increased rpm operation. We've sourced springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy. You will use the OEM retainers for this part. On parts that change direction quickly, this goes a long way! 

Specifications:

Seat Pressure: 72lbs
Coil Bind: 23mm
Seat Requirement: OEM MZR/DURATEC