Engine: Performance 9mm AASCO valve springs for Porsche 911 and 964

Our 9mm kit includes:

• AASCO HP109 high-performance valve springs
• HP10T9 titanium valve spring retainers
• HPSS valve spring cups

Suitable for:

1965-1994 Porsche 911
1988-1994 Porsche 964
1970-1972 Porsche 914-6,
1978-1979 Porsche 930 models.

AASCO's high-quality valve springs, titanium valve spring retainers, and precision valve spring cups are all designed and manufactured specifically for a Porsche application, unlike springs for other applications. They operate at a higher natural frequency than the original Porsche valve spring or OE valve springs for performance and racing engines, minimizing damage from over-revving when driving your Porsche on the track.

Technical Specifications

• Installation height 1,340” (34 mm)
  Seated pressure (lbs) 70-80
  Maximum Valve Lift 0,512” (13mm)
  Spring rate (lbs/in) 360
  Spring-loaded valve height (in): 1,13″
  Spring rate: 360 lbs/in
  Number of springs per valve: Double (including damping spring)

Definitions:

Seat height (installation height): Total height of the spring when the valve is closed and the spring is unloaded
Valve Spring Open Height: Total height of the spring when the valve is open and the spring is loaded (compressed)
Spring-loaded valve spring: When the valve spring is fully compressed, to the point that all of the coils are compressed