GSC P-D Nissan VR38DETT Conical Valve Spring Kit w/ TVS1903 Conical Spring

GSC Power-Division Conical Valve Spring Kit with Titanium Retainers — Nissan VR38DETT (5068)

A conical spring package for the GT-R's VR38, built around the TVS1903 conical spring.

Conical springs are the front runners in valvetrain harmonic stability, and that's the whole reason to spec them. The 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 24 valves is how one cylinder floats before the others.

GSC develops valvetrain components using advanced design and flow simulation software backed by real-world testing, and springs are nano peened and batched by seat pressure so the set is matched rather than assorted.

Includes 24 titanium retainers, 24 conical valve springs, and 24 valve spring shims — a full head's worth for the V6.

Fitment: Nissan GT-R R35, VR38DETT.

Do this while the heads are off. Springs and retainers are a head-apart job — if you're already in for cams or a valve job, that's 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.