Bourne HPP K20 Cylinder Head (With Beryllium Guides & Seats)

Precision Engineering for High-Performance Reliability

The Bourne HPP K20 Cylinder Head with Beryllium Copper (Be-Cu) Valve Guides & Seats is the premium choice for serious Honda K-Series builders who demand superior thermal management and durability under extreme conditions. By replacing standard OE steel components with advanced Beryllium Copper, this cylinder head solves the critical issues of heat dissipation and valve sealing often found in high-rpm or forced induction applications.

Superior Sealing and Conformity

Achieving a perfect seal is critical for maximizing compression and power. Beryllium Copper is softer than OE steel, allowing the valve seats to lap in more easily and conform precisely to the valve face.

Enhanced Seal Integrity: The material's unique properties allow for a tighter seal that steel cannot replicate, drastically reducing the tiny percentage of leak-down common in standard heads.

Reduced Expansion: Be-Cu expands significantly less than steel under operating temperatures, maintaining consistent geometry and preventing the thermal distortion that leads to sealing loss.

Advanced Thermal Management

Heat is the enemy of performance, particularly on the exhaust side. Be-Cu is an exceptional thermal conductor, far outperforming standard steel alloys.

Rapid Heat Dissipation: It actively pulls heat away from the valves (especially critical for exhaust valves), lowering combustion chamber temperatures and reducing the risk of detonation.

Stable Tolerances: Because the material sheds heat so effectively, the guides maintain better concentricity. This ensures the guide holds the optimal oil film and valve stem tolerance, leading to significantly less wear on both the valve and the guide itself.

Durability at High RPM

Reliability at the redline is non-negotiable. Beryllium Copper is naturally resistant to galling due to its material composition. In high-RPM applications where valve speeds are extreme, you are far less likely to damage a guide. This upgrade ensures your valvetrain moves smoothly, cycle after cycle.

Key Benefits

Better Heat Dissipation: Keeps valves cooler and maintains performance consistency.

Improved Sealing: Superior conformity for maximum compression.

Longer Valve Life: Reduced friction and better oil film retention protect your investment.

Technical Specifications

Material: Beryllium Copper (Be-Cu) Guides & Seats

Engine Fitment: Honda K20 

Best For: High RPM Naturally Aspirated / Forced Induction / Track Use

We also offer this service on an exchange basis or service to your own cylinder head.