Skunk2's spring bases let any Honda H-series VTEC cylinder head accept Skunk2's higher-performance Pro Series valve springs and titanium retainers originally designed for B-series engines. Each CNC-machined base is made from ultrasonically inspected steel and individually checked for dimensional accuracy. Sold as a set of 16 with a 0.480 in. inner diameter.
Specifications
| Type | Valve spring base set (adapts H-series head to B-series springs) |
| Material | CNC-machined steel |
| Inner Diameter | 0.480 in. |
| Included | Set of 16 |
| Fitment | Honda H22A / F20B (Prelude) |
| Part Number | 312-05-0015 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1997-2001 | Honda | Prelude | Base |
| 1997-2001 | Honda | Prelude | Type SH |
| 1993-1996 | Honda | Prelude | VTEC |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
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