Brian Crower BC0400S Mazda MZR/Ford Duratec 2.3L/2.5L Single Valve Spring / Steel Retainer Kit

Brian Crower BC0400S Mazda MZR/Ford Duratec 2.3L/2.5L Single Valve Spring / Steel Retainer Kit Brian Crower BC0400S is an application-specific valve spring and retainer package for Mazda MZR/Ford Duratec 2.3L/2.5L. 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 / ApplicationMazda MZR/Ford Duratec 2.3L/2.5L Product Details Manufacturer: Brian Crower Manufacturer Part Number: BC0400S Product Type: Valve Spring & Retainer Kit Fitment / Application: Mazda MZR/Ford Duratec 2.3L/2.5L Spring Type: Single Spring Part Number: BC1400 Retainer: BC2400S Retainer Material: Steel Kit Includes: Valve springs, Retainers Brian Crower Spring Specifications Free Length: 1.788" Seat Pressure: 1.400" @ 86 lbs Open Pressure: 1.000" @ 190 lbs Coil Bind: 0.835" Net Cam Lift: 0.480" / 12.19 mm Spring Seat: Uses OEM spring seat Fitment NoteWe 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.