Premium C630 Racing and Manganese Racing Bronze Valve Guide - C630 Guide, Intake/Exhaust Std

C630 Guide, Intake/Exhaust Std

• Color: Manganese Bronze

The **Kibblewhite C630 Racing and Manganese Bronze Valve Guides** are designed for high-performance intake and exhaust applications. These guides are crafted from premium materials to enhance durability, heat dissipation, and airflow. The **C630 Racing Bronze** guides contain **80% copper**, **5% nickel**, and **10% aluminum**, providing excellent thermal conductivity and wear resistance. The high copper content improves heat dissipation, while the nickel enhances hardness and corrosion resistance. Their optimized profile minimizes airflow obstruction while maintaining structural integrity in high-temperature areas, promoting both performance and longevity. For budget-conscious builders, the **C67410 Manganese Bronze** option is available. This material, with **60% copper**, offers good thermal performance and anti-galling properties. Though not as hard as C630 bronze, it can be reamed to size with a carbide reamer. Both guide types are precisely manufactured to maintain tight concentricity tolerances, ensuring optimal valve seat alignment, minimal material removal during installation, and consistent combustion chamber volumes. A flange or diameter transition feature simplifies installation by setting the correct guide protrusion without repeated measurements. Additionally, a radius transition prevents galling during installation, and the material composition makes these guides especially compatible with aluminum cylinder heads. Each kit includes **two valve guides** unless otherwise noted.