Brian Crower Dual Spring & Steel Retainer Kit w/Seats Honda Civic Si 2006-2011 | BC0040S

The Brian Crower BC0040S Dual Valve Spring & Steel Retainer Kit is designed for high-performance Honda and Acura engine builds requiring increased valvetrain stability, improved valve control, and long-term reliability under high RPM conditions. Utilizing BC1040 dual valve springs paired with durable steel retainers, this kit is ideal for street-driven turbo, supercharged, and naturally aspirated applications.

Unlike titanium retainer kits designed primarily for lightweight race applications, the BC0040S steel retainer configuration is favored for high-mileage and endurance-focused builds where durability and longevity are priorities.

Key Features & Benefits

• Complete dual valve spring and steel retainer kit
• Designed for high-RPM valvetrain stability
• Ideal for aggressive camshafts and boosted applications
• Steel retainers offer improved long-term durability
• High-grade chrome silicone alloy springs by PAC Racing
• Supports higher lift camshaft profiles
• Excellent choice for street and endurance builds
• No machine work required in most applications

Technical Specifications

• Spring Type: BC1040 Dual Valve Spring
• Free Length: 2.025"
• Seat Pressure: 80 lbs @ 1.590"
• Open Pressure: 250 lbs @ 1.110"
• Coil Bind Height: 1.030"
• Retainer: BC2011 Steel Retainer
• Spring Seat: BC2904
• Maximum Net Cam Lift: 0.550" / 13.97mm

Installation Notes

• Recommended for upgraded camshaft applications
• Professional installation strongly recommended
• Valve clearance and installed height should always be verified
• Late-model cylinder heads (2005+) may require BC2940 keepers due to Honda keeper groove angle changes.

Steel Retainers vs Titanium Retainers

Compared to titanium retainer kits, the BC0040S offers:

• Better long-term durability for street-driven vehicles
• Improved reliability in high-mileage applications
• Slightly heavier valvetrain weight but increased longevity
• Better suited for endurance and daily-driven setups

Many enthusiasts and engine builders prefer steel retainers for engines expected to see long-term street use rather than dedicated race-only operation.

Why Choose the BC0040S Kit?

The BC0040S is a popular choice because it balances:

• High-RPM performance capability
• Reliable valve control under boost
• Long-term street durability
• Compatibility with aggressive camshaft setups

It’s an excellent solution for Honda enthusiasts building a dependable high-performance K-series or F-series engine.