Kibblewhite Precision C630 Guide, Exhaust + 0.010

• Type: Valve Guide

The Kibblewhite Precision C630 Exhaust Valve Guide (+0.010) is designed to optimize airflow while maintaining durability in high-temperature areas. Its streamlined profile enhances airflow, often improving performance even without additional modifications. The guide features a flange or diameter reduction to ensure proper installation height, facilitating seal-to-retainer clearance for aggressive cam setups. Tight concentricity tolerances help maintain optimal seat-to-guide alignment, reducing material removal during valve jobs and ensuring consistent chamber volumes. Made from C630 Racing Bronze, this guide contains 80% copper, 10% aluminum, and 5% nickel, providing excellent thermal conductivity, wear resistance, and corrosion protection-especially beneficial for modern fuels. The high copper content enhances heat dissipation, while the aluminum composition ensures compatibility with aluminum cylinder heads. A smooth radius transition helps prevent galling during installation. This guide offers superior resistance to galling, allowing for tighter clearances that improve valve-to-seat sealing and oil control. It is ideal for high-performance applications requiring durability and precision. Kit includes two valve guides unless otherwise noted.