Porsche Value Spring and Titanium Retainer Kit - 8mm - 911 (933) | 1995-1998 HP10T8-HP109-HPSS-PKG

Designed specifically for Porsche applications—not adapted from other platforms—this kit delivers a higher natural frequency than factory OE springs, making it ideal for performance and racing engines while helping minimize potential over-rev damage on track.

Tech Specs:

• Installed Height: 1.340” (34mm)

• Seat Pressure: 70–80 lbs

• Max Valve Lift: .512” (13mm)

• Spring Rate: 360 lbs/in

• Coil Bind Height: 1.13”

• Dual springs (includes damper spring)

Definitions:

• Installed Height: Spring height with the valve closed.

• Open Height: Spring height with the valve open under load.

• Coil Bind: Point at which the spring is fully compressed and coils are stacked.