Brian Crower 31mm Exhaust Valve Set (8pcs) Honda Civic Si 2006-2011 | BC3045

Fitment

• Honda Civic Si (2006–2011 K20Z3 applications)
• Acura RSX Type-S (K20A2)
• Acura TSX (K24A2 builds with K-series heads)
• Other K20/K24 hybrid and swap applications

The Brian Crower BC3045 Exhaust Valve Set is a performance upgrade designed for Honda and Acura K-Series engines, including K20A2, K20A, and K20Z3 applications. These valves are engineered for high-RPM and high-performance builds where improved exhaust flow, durability, and heat resistance are critical.

With a +1mm oversized 31mm head diameter, this set is built to improve exhaust gas evacuation from the combustion chamber, supporting better breathing and higher power potential in naturally aspirated and forced induction setups.

Key Features & Benefits

• Set of 8 exhaust valves (full engine set)
• 31mm +1mm oversized head diameter for improved exhaust flow
• Premium stainless steel construction for high heat resistance
• Friction-welded Stellite tips for durability under extreme conditions
• Undercut stem design reduces weight and improves airflow efficiency
• Swirl-polished finish for reduced friction and improved gas flow
• Designed for high-RPM and high-boost engine builds

Performance Advantages

• Improved exhaust scavenging for better cylinder evacuation
• Enhanced airflow for increased horsepower potential
• Stronger resistance to heat-related valve failure
• Reduced valvetrain stress at high RPM
• Better efficiency for built heads with upgraded cams and springs

Important Notes

• +1mm oversized valves require machine work
• Cylinder head must be professionally cut for larger valve seats
• Recommended for built engines, not OEM replacement use
• Requires proper valvetrain setup (springs, retainers, cam clearance checks)
• Not a direct drop-in installation

Why Choose BC Valves?

Brian Crower is known for producing high-strength valvetrain components designed for performance engine builds. These valves are commonly used in high-RPM Honda K-series builds, where stock components become a limitation under increased airflow, boost, and camshaft aggressiveness.