This Ferrea kit replaces the RB26DETT valvetrain springs and retainers with dual springs rated at 110 lbs on the seat at 39.00mm and cleared for 12.00mm of maximum lift, giving the valve control needed for higher lift camshafts and sustained high rpm. Titanium retainers cut reciprocating weight over the factory steel parts, and the kit covers all 24 valves with matched seat locators and valve locks so the installed height is set correctly across the head.
Specifications
| Type | Dual valve spring and titanium retainer kit |
| Engine Application | Nissan RB26DETT |
| Chassis | Nissan Skyline GT-R R32, R33, R34 |
| Seat Pressure | 110 lbs @ 39.00mm |
| Maximum Lift | 12.00mm |
| Springs | Dual springs, Ferrea S10090 (24) |
| Retainers | Titanium, Ferrea E11057 (24) |
| Seat Locators | Ferrea SL1047 (24) |
| Valve Locks | Ferrea K10072 (24) |
| Part Number | KT4052 |
| Quantity | 1 kit (covers 24 valves) |
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
