GSC P-D Nissan RB26DETT 30.15mm Head STD 101.74mm Long Exhaust Valve - Set of 12

GSC Power-Division Exhaust Valves — Nissan RB26DETT, 30.15mm Head, Standard (2143-12)

The exhaust-side companion set for the RB26. GSC develops their valvetrain components using advanced design and flow simulation software backed by real-world performance testing, which is why these show up in built RB heads rather than factory valves.

Specs: 30.15mm head diameter, 101.74mm overall length, standard stem size. Set of 12 — one full exhaust side for an RB26.

Standard stem and OEM dimensions mean this drops into a stock or freshened head with no guide work and no retainer or spring changes required.

Exhaust valves live the harder life. They sit in combustion gas on the way out with far less cooling than the intake side, and on a boosted RB26 running high exhaust gas temperatures that's where valve failure starts. On any engine that's seen serious boost or a lot of heat cycles, replacing the exhaust side is the higher priority of the two.

Pair with matched springs and retainers. A valve is one piece of a system — if the build is running aggressive cams or high RPM, the spring package needs to suit.

Verify against your head before ordering. Confirm current valve length and head diameter, especially if the head has been machined or has aftermarket seats. Oversize (+1mm) and +1.5mm tip versions exist under separate part numbers if the head has already been cut.

Intake valves are a separate part number — most builds replace both sides at once.