Brian Crower Dual Spring & Steel Retainer Kit w/o Seats Honda Civic Si 2006-2011 | BC0040SX

The Brian Crower BC0040SX Dual Valve Spring & Steel Retainer Kit is engineered for high-performance Honda and Acura engine builds that demand improved valvetrain stability at elevated RPM levels. Designed for K-series and F-series engines, this kit combines BC1040 dual valve springs with durable steel retainers to provide reliable valve control for aggressive camshafts, forced induction setups, and high-revving applications.

Unlike lightweight titanium retainers commonly used in race-only builds, the steel retainers in the BC0040SX kit are ideal for high-mileage street cars and daily-driven performance applications, offering increased long-term durability and reliability.

Key Features & Benefits

• Complete dual valve spring and steel retainer kit
• Designed for high-RPM stability and valve control
• Recommended for aggressive camshaft setups
• Steel retainers provide improved longevity for street-driven vehicles
• Manufactured using premium chrome silicone alloy springs
• No machine work required in most applications
• Supports increased valve lift and engine RPM capability
• Ideal for turbocharged, supercharged, and naturally aspirated builds

Technical Specifications

• Spring Type: BC1040 Dual Spring
• Seat Pressure: 80 lbs @ 1.590"
• Open Pressure: 250 lbs @ 1.110"
• Coil Bind Height: 1.030"
• Maximum Net Cam Lift: 0.550" / 13.97mm
• Retainers Included: BC2010 Steel Retainers
• Spring Seat: OEM-style configuration

Important Installation Notes

• Recommended for upgraded camshaft applications
• Late-model cylinder heads (2005+) may require BC2940 keepers due to Honda keeper groove angle changes
• Professional installation strongly recommended
• Proper valve clearance and installed height should always be verified
• Seats are not included with the BC0040SX kit

Why Choose the BC0040SX Kit?

This kit is especially popular among Honda enthusiasts because it balances:

• High-RPM performance capability
• Long-term durability
• Street-friendly reliability

For daily-driven turbo or all-motor K-series builds, the steel retainers offer excellent longevity compared to titanium retainers in long-mileage applications.