BC3011S-8 – Honda/Acura B16A/B18C Exhaust Valves (28mm / STD) – set/8

For the dedicated builder of Honda B-Series VTEC engines, valve train integrity is not a suggestion—it’s the foundation of power and reliability. The Brian Crower BC3011S-8 exhaust valve set represents a critical upgrade for the B16A and B18C platforms, engineered to replace the OEM component with a superior part designed for enhanced performance and durability. These 28mm standard-size exhaust valves are crafted for the purist seeking uncompromising quality for high-RPM, high-output naturally aspirated or forced induction applications. Built to exacting specifications from premium materials, this set of eight valves delivers the precise balance of strength and weight reduction needed to stabilize the valve train, reduce float, and unlock the full potential of your engine’s airflow. This is not a generic replacement; it is a calculated component for those who understand that power is built from the inside out.

Engineering & Material Superiority

The BC3011S-8 valves are manufactured from a proprietary high-temp, chromemoly stainless steel alloy. This material selection is a direct response to the extreme thermal and mechanical stresses encountered in the exhaust port of a high-performance Honda B-series engine. Where OEM valves may succumb to tulip fatigue, margin erosion, or stem galling under sustained high-RPM operation, the Brian Crower formulation maintains superior tensile strength and resistance to creep. The one-piece, forged construction eliminates potential failure points, ensuring consistent molecular structure from the tip of the stem to the margin of the head. Each valve undergoes precision machining and a multi-stage polishing process, resulting in a stem surface finish that promotes optimal oil film retention and reduces friction against the valve guide, a critical factor for longevity in motorsport environments.

Precision Design for Optimal Flow & Stability

Maintaining the OEM-standard 28mm head diameter and 4.990″ (126.75mm) overall length ensures a direct, drop-in fitment for the stock valve seat, but the similarities end there. Brian Crower engineers have optimized the underhead profile and backside radius to improve exhaust gas scavenging. This refined contour reduces flow restriction as gases exit the combustion chamber, contributing to a more efficient exhaust cycle. Furthermore, attention has been paid to weight management. Through careful machining of the stem and head profile, these valves achieve a slight but strategic weight reduction compared to many factory units. In a valve train where inertia is the enemy, especially in the 8,000+ RPM range common to B16A and B18C engines, this reduction minimizes the kinetic energy required to open and close the valve. This translates directly to reduced stress on valve springs, retainers, and the camshaft lobes, allowing for more aggressive cam profiles and higher, stable rev limits.

Key Performance Benefits

• Enhanced High-Temperature Strength: Chromemoly stainless steel construction resists deformation and oxidation under extreme exhaust heat, far exceeding OEM capabilities.
• Optimized Flow Characteristics: Precision-machined head profile improves exhaust scavenging for increased volumetric efficiency and power.
• Strategic Weight Reduction: Engineered lighter than stock to reduce valve train inertia, mitigating float and allowing for higher, stable RPM limits.
• Superior Durability: One-piece forged design and polished stems dramatically increase service life in high-stress racing or boosted applications.
• Direct OEM Replacement: Maintains standard 28mm diameter and critical dimensions for a perfect fit in factory or aftermarket B-series cylinder heads without machining.

Installation & Critical Clearance Notes

While the BC3011S-8 valves are designed as a direct replacement, professional installation is non-negotiable. Every valve job must include a three-angle cut on the cylinder head seat to match the new valve’s profile and ensure a perfect, concentric seal. Stem-to-guide clearance must be verified with a micrometer; we recommend a clearance of 0.001″ to 0.0025″ for street performance and up to 0.0035″ for all-out race engines. It is imperative to pair these valves with matching, high-quality components. They are designed to work in concert with Brian Crower’s dual or beehive valve springs (BC0240/BC0245), titanium retainers (BC1620), and hardened steel locks. Using worn or underspec ancillary components will compromise the entire system’s integrity. Always perform a post-assembly “blueprinting” check, verifying installed height, spring pressure, and retainer-to-seal clearance. For a deeper technical dive into proper valve train setup and dynamics, consult this authoritative resource on valvetrain geometry and best practices.

Vehicle Fitment & Application

The Brian Crower BC3011S-8 valve set is engineered specifically for the legendary Honda B-Series DOHC VTEC four-cylinder engines. These are exhaust valves only (a set of 8 is required for a complete 4-cylinder engine). Primary applications include, but are not limited to:

• Honda Civic Si/Type R (EG/EK): 1992-2000 models equipped with the B16A or B16B engine.
• Honda Integra GS-R/Type R (DC2): 1994-2001 models with the B18C1 (GS-R) or B18C5 (Type R) engine.
• Acura Integra GS-R (DC4/DB8): 1994-2001 models.
• Honda Del Sol VTEC (EG2): 1993-1997 models with the B16A3 engine.
• Civic/CRX Si (EF): Applications utilizing a B16A swap.

Note: Always verify your specific engine code and cylinder head casting number before purchase. While these valves fit the standard 28mm exhaust seat, aftermarket or modified heads may have different specifications.

Technical Specifications