Brian Crower BC0100S Steel Spring/Retainer Kit for 4G63 Evo VIII/IX & 1G-2G DSM

Vehicle Fitment

• Mitsubishi 4G63 engine platform:
• Evolution VIII, Evolution IX
• 1G / 2G DSM (1990-1999 Eclipse GST/GSX)
• Talon TSi (1990-1998)
• Laser RS (1990-1994)
• Galant VR-4 (1991-1992)

Features

• High-RPM chrome silicone alloy valve spring, wound by PAC Racing
• CNC-machined steel retainer for strength and durability
• Designed for demanding boost and high-RPM applications
• No machining required for installation
• Supports aggressive cam lifts up to 0.520" (13.2 mm)
• High seat (84 lb) and open (235 lb) pressures enhance valve control
• Proprietary processing ensures consistent spring dynamics
• Built to withstand extended use in performance engines

Specifications

• Free Length: 1.879"
• Seat Pressure: 1.550" @ 84 lbs
• Open Pressure: 1.000" @ 235 lbs
• Coil Bind: 0.935"
• Net Cam Lift Supported: 0.520" / 13.2 mm
• Retainer: Steel, BC2100S
• Spring Type: Single PAC Racing chrome silicone alloy spring
• Fitment Location: Front head (per 4G63 configuration)

Included Components

• 1x set of 16 valve springs
• 1x set of 16 steel retainers (BC2100S)

Product Description

The Brian Crower BC0100S Steel Spring/Retainer Kit is engineered for high-performance applications in Mitsubishi 4G63 platforms. Featuring premium PAC Racing chrome silicone alloy springs and durable steel retainers, this kit delivers outstanding valve stability under high RPM and boost. With high seat and open pressures, it ensures exceptional valvetrain control while supporting net cam lifts up to 0.520" (13.2 mm).

Installation is straightforward with no machine work required. Fitment is confirmed for Evo VIII/IX models and early-generation 1G/2G DSM platforms - including Eclipse GST/GSX, Talon TSi, Laser RS, and Galant VR-4. Coverage spans all applicable model years listed; there are currently no gaps in validation.

Ideal for racers and tuning enthusiasts pushing high power and aggressive cam profiles, the BC0100S kit elevates valvetrain reliability and performance. Always verify compatibility with your specific build and respect proper assembly practices for valve spring pre-load and retainer torque.