The all new PRC .675" spring kit uses a highly advanced EHT Chrome Silicon spring wire for incredible high RPM valvetrain stability. This Extra High Tensile Strength spring wire offers unmatched reliability and performance compared to competitors LSx valve springs. The EHT Chrome Silicon spring wire allows over 2.5 times the life of previous tested LS valve springs! By using the best possible materials & carefully tuning both the inner & outer springs frequencies, PRC has made a valve spring that is more stable at resisting harmful harmonics that can lead to failures.
This spring kit has been tested well past the recommended limits, we have successfully dyno-tested the EHT spring kit to well over 7,400 rpm at .708" of lift! The best part of this spring kit is it's priced at well over $200 cheaper than competitors spring kits that are designed to compete with it!
Kit includes: Spring Seats, Valve Seals, Dual Springs, and Titanium
Retainers (utilizes GM factory valve stem locks, not included)
Closed Spring Pressure: 148lbs @ 1.810"
Open Spring Pressure: 450 lb. @ .600" lift
Open Spring Pressure: 490 lb. @ .675" lift
Maximum Spring Lift: .675"
Coil Bind 1.060"
Spring Rate: 483lbs/in