Bourne Honda K24 Complete Pre-Assembled Cylinder Head

Bourne HPP Honda K24 Pre-Assembled Cylinder Head Elevate your Honda K-Series build with the Bourne HPP Pre-Assembled Cylinder Head, a turnkey solution designed for elite level power and reliability. By integrating advanced thermal management with high-strength valvetrain components, this assembly solves the most common failure points found in high-RPM and high-boost K24 applications. Key Assembly Features 1. Bourne HPP K24 Head with Beryllium Copper (Be-Cu) Seats & Guides The heart of this assembly is the upgraded cylinder head featuring Beryllium Copper seats and guides. This material is the gold standard for racing engines: Rapid Heat Dissipation: Be-Cu pulls heat away from the valves significantly faster than steel, lowering combustion temperatures and preventing detonation. Superior Sealing: The slightly softer nature of Be-Cu allows for better conformity between the valve face and the seat, resulting in near-zero leak-down. Extreme Durability: Naturally resistant to galling and thermal distortion, ensuring your valvetrain geometry remains perfect even at high RPMs. 2. Choice of Premium Valve Springs We offer two industry-leading options to eliminate valve float and ensure the engine breathes accurately at the redline: Bourne HPP Valve Springs: The in-house precision choice. Manufactured from Silicon Chrome (SiCr) for maximum fatigue resistance and rated for 350–700 HP in boosted applications. Designed for a straightforward fitment using original platform shims and retainers. Supertech K20/K24 Valve Spring Kit: The global industry standard. Perfect for builders who prefer brand consistency with other Supertech components, offering proven high-RPM stability and compatibility with aggressive aftermarket cams. 3. Bourne HPP Valve Set The valvetrain is completed with our high-grade EN52 steel valves, designed for maximum flow and durability. Super Polished Finish: Reduces carbon buildup and optimizes airflow. Pulse Plasma Nitriding: Creates an ultra-hard surface that reduces friction within the guides and extends the lifespan of the entire valvetrain. Technical Specifications Component Specification Engine Fitment Honda K24 Seat/Guide Material Beryllium Copper (Be-Cu) Valve Material EN52 Steel (Pulse Plasma Nitrided) Spring Options Bourne HPP OR Supertech Power Rating 200–350 HP (NA) / 350–700 HP (Boosted) Valve Count 8x Inlet, 8x Exhaust Why Choose a Pre-Assembled Head? Building a high-performance head requires meticulous measurement of installed heights, guide clearances, and coil bind. When you purchase this pre-assembled unit, you are receiving a competition-ready component. Every valve is lapped, every spring is checked, and every tolerance is verified by Bourne HPP technicians. Best For: High-RPM Naturally Aspirated Track Builds High-Boost Forced Induction (Turbo/Supercharged) Competitive Endurance Racing Service Note: We also offer this specification as a service to your existing cylinder head or on an exchange basis. Please contact us for details on core returns.