Cosworth EVO X Valve Spring Upgrade (4B11)

Available Now! Single valve spring upgrade for the Mitsubishi 4B11T (Evolution X). Cosworth High RPM Valve Springs are wound from the world’s finest Japanese Kobe steel and feature dual chamfered ends to reduce wear on seats and retainers. Our High performance springs have been engineered with increased seat pressure along with higher lift capability for optimum performance potential and improved valve control. Single spring design allows easy installation with no machining required and is perfect for typical high performance use. Compatible with OE spring retainers.

• Manufactured from the finest Japanese Kobe steel
• Single spring design for easy installation
• Dual chamfered ends
• Increased performance

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