Brian Crower Valve Springs for Mitsubishi 4B11T Evo X / Hyundai G4KF Genesis ...

Brian Crower Valve Springs for Mitsubishi 4B11T / Hyundai G4KF High-performance, reliable valve springs engineered by Brian Crower for the Mitsubishi 4B11T (Evo X) and Hyundai G4KF (Genesis) engines. Designed for street, track, and forced-induction applications where valve control, durability, and consistent seat pressure matter. Precision fit: Direct-fit replacement for 4B11T and G4KF cylinder heads — no machining required. Improved spring rates: Optimized for higher rpm and aggressive cam profiles to prevent coil bind and valve float. Durable construction: Premium alloy steel with heat treatment and shot peening for long life under high stress. Consistent seat pressure: Maintains stable valve seating for improved combustion and throttle response. Ideal for forced induction: Handles higher cylinder pressures from turbocharged setups. Upgrade your engine's valvetrain with Brian Crower valve springs to achieve better high-rpm stability, improved power delivery, and race-ready reliability. Compatible with performance builds and OEM replacements for the Evo X and Genesis platform.