Supertech's Titanium Retainers and Valve Springs (made with premium Superclean Chrome Silicon Vanadium Steel alloy) allow for higher performance & durability at high rpms and better memory. Computer designed to ensure that wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue for long durability under extreme conditions and ensuring that the harmonics are well under control.

Single Valve Spring Specs:
- Outer Spring O.D.: 28.10mm
- Outer Spring I.D.:  20.00mm
- Seat Pressure: 76 @ 39.6
- Open (lift) Pressure: 200 @ 11.5
- Max Lift: 14.90mm
- Coil Bind: 24.70mm
- Rate: 10.50 lbs/mm

Included in Kit:
- SPR-M1007S (Valve Springs)
- RET-M65/T1 (Titanium Retainers)
ST-SPRK-M1007S

Dual Valve Spring Specs:
- Outer Spring O.D.: 28.10mm
- Outer Spring I.D.:  20.00mm
- Inner Spring O.D. 20.00mm
- Inner Spring I.D.: 15.20mm
- Seat Pressure: 92 @ 39.6
- Open (lift) Pressure: 247 @ 11.5
- Max Lift: 14.90mm
- Coil Bind: 24.70mm
- Rate: 12.50 lbs/mm

Included in Kit:
- SPR-M1007D (Dual Valve Springs)
- RET-M65/T1 (Titanium Retainers)
- SEAT-M1007D (Valve Seats)
- VS-H6.6 (Reduced O.D. Valve Seals)
ST-SPRK-M1007D

Dual springs pictured below, single above.