Brian Crower BC0100S Mitsubishi 4G63 Eclipse/Evo Single Valve Spring / Steel Retainer Kit

Brian Crower BC0100S is an application-specific valve spring and retainer package for Mitsubishi 4G63 Eclipse/Evo. The matched components are intended to provide controlled spring pressure and stable valvetrain operation in performance applications when installed to the correct height and clearance.

Fitment / Application

Mitsubishi 4G63 Eclipse/Evo

Product Details

• Manufacturer: Brian Crower
• Manufacturer Part Number: BC0100S
• Product Type: Valve Spring & Retainer Kit
• Fitment / Application: Mitsubishi 4G63 Eclipse/Evo
• Spring Type: Single
• Spring Part Number: BC1100
• Retainer: BC2100S
• Retainer Material: Steel
• Kit Includes: Valve springs, Retainers

Brian Crower Spring Specifications

• Free Length: 1.879"
• Seat Pressure: 1.550" @ 84 lbs
• Open Pressure: 1.000" @ 235 lbs
• Coil Bind: 0.935"
• Net Cam Lift: 0.520" / 13.2 mm
• Spring Seat: Uses OEM spring seat

Fitment Note

We identify many performance components by engine family rather than by every individual chassis. Verify the engine code, cylinder head/valvetrain configuration, and required supporting components before ordering, especially on engine swaps or modified vehicles.

Always verify installed height, coil-bind clearance, retainer-to-seal/guide clearance, and camshaft lift before final engine assembly.