Brian Crower Dual Spring & Titanium Retainer Kit w/Seats Honda Civic Si 2006-2011 | BC0040

The Brian Crower BC0040 Dual Valve Spring, Titanium Retainer & Seat Kit is engineered for high-performance Honda and Acura engine builds that require superior valvetrain stability at elevated RPM levels. Designed specifically for K-series and F-series applications, this kit combines BC’s proven dual valve springs, lightweight titanium retainers, and hardened spring seats to support aggressive camshafts, forced induction, and high-revving naturally aspirated setups.

Manufactured using premium PAC Racing springs and precision-machined titanium retainers, the BC0040 kit is a popular choice for enthusiasts building serious street, drag, road race, or time attack engines.

Key Features & Benefits

• Complete dual valve spring, titanium retainer, and spring seat kit
• Designed for high-RPM and aggressive camshaft applications
• Lightweight 6AL4V titanium retainers reduce valvetrain mass
• Premium PAC Racing chrome silicone alloy valve springs
• Increased valve control at elevated RPM
• Supports turbocharged, supercharged, and naturally aspirated builds
• No machine work required in most applications
• Ideal for performance street and race builds

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: BC2010 Titanium Retainer
• Spring Seat: BC2904
• Maximum Net Cam Lift: 0.550" / 13.97mm

Installation Notes

• Professional installation strongly recommended
• Proper installed height and valve clearance should always be verified
• Late-model cylinder heads (2005+) may require BC2940 keepers due to Honda keeper groove angle revisions.
• Recommended for upgraded camshaft applications
• Designed for high-RPM use and performance engine builds

Titanium Retainer Advantages

Compared to steel retainers, titanium retainers provide:

• Reduced valvetrain weight
• Faster valve response at high RPM
• Improved resistance to valve float
• Better performance in racing and high-revving applications

Many enthusiasts choose titanium retainer setups when building engines designed for aggressive cam profiles and sustained high-RPM operation.

Why Choose the BC0040 Kit?

The BC0040 is one of the most popular K-series valvetrain upgrades because it balances:

• High-RPM reliability
• Lightweight valvetrain performance
• Compatibility with aggressive camshafts
• Proven durability in competitive motorsports

It’s commonly used in turbocharged Civic Si builds, all-motor K-series race engines, and high-performance Honda street cars pushing beyond OEM valvetrain limits.