Skunk2's Pro Series XP (Extra Pressure) racing valve springs raise seat pressure for turbocharged and extreme high-rpm B-series VTEC builds, running 93 lbs. at 1.320 in. while preserving coil-bind height for high-lift cams. Wound from super-clean chrome-silicone wire milled in Japan, the dual inner and outer springs prevent valve float and hold valvetrain stability past 11,000 rpm. Sold as a set of 16.
| Type | Pro Series XP racing dual valve springs |
| Material | Super-clean chrome-silicone wire (Japan) |
| Seat Pressure | 93 lbs. at 1.320 in. |
| Open Pressure | 238 lbs. at 0.820 in. |
| Coil Bind | 0.718 in. |
| Included | Set of 16 |
| Fitment | Honda/Acura B-series VTEC (B16A, B17A, B18C) |
| Part Number | 311-05-7350 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1992-2001 | Acura | Integra | GS-R |
| 1997-1998,2000-2001 | Acura | Integra | Type R |
| 1999-2000 | Honda | Civic | Si |
| 1994-1997 | Honda | Civic del Sol | VTEC |
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