Brian Crower BC0040TS High-Lift Dual-Spring Retainer Kit for Honda K20A/K20Z/F20

Vehicle Fitment

• 2001-2005 Honda Civic Si (K20A3, 2.0L) -- North America
• 2002-2005 Honda Acura RSX Type-S (K20A2/A3, 2.0L) -- North America
• 2004-2009 Honda S2000 (F20C/F22C, 2.0L/2.2L) -- North America & Japan
• 2002-2005 Honda CR-Z Mugen/Type R (K20Z1, 1.5L) with K-series swap
• Honda K20A/K20Z/K24A-based engines in swap applications meeting same valvetrain geometry

Fitment Notes

• High-lift dual-spring kit including retainer and seat; designed for high-RPM performance cams.
• Requires cylinder head compatible with K20A/K20Z/F20C/F22C valvetrain dimensions.
• May need BC2940 or other specific keepers/locks if using late-model heads (post-2004 groove change).
• Not compatible with stock springs or low-lift cams--designed for cam lifts up to ~0.62" / 15.7 mm.

Features

• Dual-spring configuration reduces spring mass and improves valve control at high RPM.
• Steel retainer and seat construction for durability in high-lift builds.
• Pre-set seat pressure and open lift: Seat at 1.590" @ 80 lbs, open at 1.020" @ 215 lbs.
• No machining required for correct fit--direct drop-in for compatible heads.
• High lift capacity supports up to 0.620" (~15.74 mm) cam lift without coil-bind.
• Ideal for road/race hybrids and serious street/strip builds with K-series engines.
• Manufactured with precision CNC processes to meet demanding performance standards.

Specifications

• Part Number: BC0040TS
• Type: Dual-Spring Retainer/Seat Kit (Steel Retainer) for High-Lift Cams
• Compatible Engines: Honda K20A/K20Z, Acura K20A2/A3, Honda F20C/F22C
• Seat Height: 1.590" (~40.4 mm)
• Seat Pressure: 80 lbs
• Open Height: 1.020" (~25.9 mm)
• Open Pressure: 215 lbs
• Coil-Bind Height: 0.870" (~22.1 mm)
• Maximum Net Cam Lift: 0.620" (~15.74 mm)

Included Components

• 1x Set of Brian Crower dual-spring kit (enough for full cylinder head)
• 1x Set of steel retainers and seats (part of kit)
• Installation instructions with valve train clearance specifications

Product Description

The Brian Crower BC0040TS High-Lift Dual-Spring Retainer Kit is engineered for Honda and Acura K-series engines (K20A/K20Z) and Honda F-series (F20C/F22C) where performance builds require higher RPM capability and more aggressive cam profiles. This kit features a dual-spring setup and steel retainers/seats optimized for up to .620" lift (~15.7 mm), allowing serious street/strip or race use without compromising reliability.

Installation is straightforward as a drop-in for compatible heads, though some later-model Honda heads (post-2004) may require upgraded keepers due to groove changes. Whether building a high-RPM Civic Si, RSX Type-S, S2000 or K-series swap setup, this kit gives your valve train the foundation to handle high lift, high RPM and higher boost loads while maintaining valve control and durability.