GSC P-D Nissan RB26DETT/RB26 Conical Valve Spring Kit

GSC Power-Division Conical Valve Spring Kit with Ti Retainers — Nissan RB26DETT (5075)

A conical valve spring kit with titanium retainers for the RB26, built for high-RPM, high-boost builds.

Conical springs are the reason to spec this. A conical spring's coil diameter tapers, which drops the spring's own mass and shifts its natural frequency away from the harmonics that cause surge. Less reciprocating mass and better resistance to resonance means the valvetrain stays controlled at RPM where a conventional round-wire spring starts to float — and float is what puts a valve into a piston.

The tapered geometry also lets the coils nest as they compress, so you get more usable lift before coil bind.

Titanium retainers cut reciprocating mass further and reduce the load the spring has to control. GSC machines them CNC with tolerances and repeatability that keep seat pressure consistent across every valve in the head — uneven seat pressure across twelve valves is how one cylinder floats before the others.

Springs are nano-peened and batched by seat pressure within GSC's spec, so the set is matched rather than assorted.

Fitment: 89-94 Nissan Skyline R32, 95-98 R33, 99-02 R34. RB26DETT.

Do this while the head is off. Springs and retainers are a head-apart job, so if you're already in for valves, guides, or a valve job, this is the time.

Verify your cam profile before ordering. A spring that doesn't suit the lobe either floats or coil binds, and both end the engine.