GSC Power-Division 5042 Beehive Valve Spring Kit w/Ti Retainers for 08-15 Evo X

Vehicle Fitment

• 2008-2015 Mitsubishi Lancer Evolution X (4B11T)
• 2009-2015 Mitsubishi Lancer Ralliart (4B11T) and Sportback (4B11T)

Features

• Beehive high-performance valve spring design for improved valvetrain control
• Titanium retainers reduce rotating mass for quicker rev response
• Ovate wire construction with advanced heat treatment for enhanced durability
• Superior load retention and fatigue resistance vs stock springs
• Stable valve control up to high RPM and boost levels
• Compatible with aggressive cam profiles up to ~12.2 mm lift
• Ideal for high-boost turbo and track-oriented builds
• Direct replacement for OEM 4B11T valve springs

Specifications

• Part Number: 5042
• Spring Type: Beehive valve springs with titanium retainers
• Install Height: ~1.350" (intake) / ~1.361" (exhaust) @ seat
• Seat Pressure: ~75 lbs (intake) / ~72 lbs (exhaust)
• Open Pressure: ~217 lbs @ ~0.917" / ~214 lbs @ ~0.928"
• Coil Bind: ~0.800"
• Camshaft Compatible: Up to ~12.2 mm lift
• Max RPM: ~9,500-9,800 RPM
• Max Boost Support: ~40 psi

Included Components

• 16x Beehive valve springs
• 16x Titanium retainers

Product Description

The GSC Power-Division 5042 Beehive Valve Spring Kit with titanium retainers is a premium valvetrain upgrade engineered for Mitsubishi Lancer Evolution X and Ralliart 4B11T turbocharged engines. Featuring a beehive spring design crafted from advanced ovate wire and matched with lightweight titanium retainers, this kit improves valve control and reduces valvetrain mass for quicker engine response and higher rev capability.

Designed to handle aggressive cam profiles up to approximately 12.2 mm lift and support engine speeds near ~9,500-9,800 RPM under boosted conditions up to ~40 psi, the 5042 springs provide enhanced stability and durability for high-performance builds. Whether you're building a high-boost street car or a track-focused Evo X, these springs deliver improved valve authority and reliability compared with OEM components. Installation is direct OEM replacement on 4B11T heads and recommended alongside proper tuning to fully realize performance gains.