Product Overview
Supertech Inconel Exhaust Valves for Nissan RB26DETT – +1mm Oversize, Set of 12
Exhaust valves are the hottest-running parts in a turbocharged RB26. Once boost, timing and RPM go up, standard valves become the weak link. The Supertech NEVI-1032-7-12 set replaces all twelve exhaust valves with one-piece forged Inconel-Nimonic valves built to keep their strength at sustained high exhaust gas temperatures.
More flow from a +1mm oversize head
At 31.15mm, the valve head is 1mm larger than the factory 30.15mm exhaust valve. Paired with matching seat work and a ported head, the larger valve helps the engine clear exhaust gas more efficiently at high RPM – ideal for big single-turbo conversions, uprated twins and stroker builds.
Built for boost and heat
- Inconel-Nimonic alloy – nickel-based superalloy that resists heat, corrosion and fatigue in high-EGT turbo applications
- One-piece forging – no welded head-to-stem joint to fail under load
- Back-cut head and undercut stem – improved flow around the valve
- Hardened tip – resists wear from the valvetrain
- Superfinished stem – low friction and reduced guide wear
Specifications
| Brand | Supertech Performance |
|---|---|
| Part number | NEVI-1032-7-12 (also listed as NEVI-1032/7-12) |
| Valve type | Exhaust |
| Head diameter | 31.15mm (+1mm oversize) |
| Stem diameter | 6.94mm |
| Overall length | 101.20mm (standard length) |
| Material | Inconel-Nimonic |
| Groove type | Single groove |
| Quantity | Set of 12 |
Fitment
- Nissan Skyline GT-R R32 (BNR32) – RB26DETT
- Nissan Skyline GT-R R33 (BCNR33) – RB26DETT
- Nissan Skyline GT-R R34 (BNR34) – RB26DETT
- Nissan Stagea 260RS and other RB26DETT-powered builds
Fitting notes
These are oversize valves. The cylinder head must be machined to suit the 31.15mm head, so professional installation by an engine builder or machine shop is required. Standard 101.20mm length suits factory-style valvetrain geometry; for reground cams, ask us about the longer-tip version.
Frequently asked questions
Do I need all 12?
Yes. The RB26DETT has 12 exhaust valves (two per cylinder), and this set covers the full engine.
Are these sodium-filled?
No. These are solid Inconel valves. Supertech offers a separate sodium-filled version if you need it.
Will they drop into a standard head?
No. The +1mm head requires the valve seats to be cut or replaced to suit.
