Bourne HPP Inlet & Exhaust Valve Set Honda Civic K20 K24

Bourne HPP K-Series High Performance Dual Valve Set

Complete your cylinder head build with this full set of premium inlet and exhaust valves, developed by Bourne HPP. Designed as a superior replacement for standard components, this kit ensures your engine can withstand the extreme thermal and mechanical stresses of high-RPM K20 and K24 applications.

Manufactured from high-grade EN52 steel, these valves offer robust durability for both intake and exhaust cycles. The addition of a Pulse Plasma Nitrided coating significantly increases surface hardness and wear resistance, while the super polished finish ensures smoother airflow and helps prevent carbon buildup, making them an ideal upgrade for both turbocharged and high-compression naturally aspirated setups.

Key Specifications

• Fitment: K20 / K24 (Complete Head Set)

• Material: EN52 Steel

• Finish: Super Polished

• Coating: Pulse Plasma Nitrided

• Dish Capacity: 0.31cc

• Status: Performance upgrade

Performance Pedigree

These valves have been selected for their ability to deliver consistent performance under racing conditions. The EN52 material provides exceptional thermal stability, preventing warping under high exhaust temperatures, while the Pulse Plasma Nitriding process reduces friction and improves scuff resistance in the guides. Combined with the super polished finish, this full set ensures your engine breathes freely and reliably at the limit.

Kit Contents

• 8x Bourne HPP Inlet Valves

• 8x Bourne HPP Exhaust Valves

Installation Note: This kit contains 16 valves, providing a complete replacement for a standard K-Series cylinder head. When installing, we recommend checking valve-to-guide clearances and ensuring a proper valve seat seal. We recommend professional installation and machining if required.