Kibblewhite Precision C630 Guide, Intake + 0.001

• Type: Valve Guide

The Kibblewhite Precision C630 Intake Valve Guide (+0.001) is engineered for optimal airflow and durability. Designed with a streamlined profile, it minimizes obstruction while maintaining critical thickness in high-temperature areas. In many cases, simply installing these guides improves airflow without additional modifications. A built-in flange ensures precise protrusion height for proper seal-to-retainer clearance, eliminating the need for repeated measurements during installation. If a flange would interfere with the factory base washer, a slight diameter reduction marks the correct protrusion instead. Tight concentricity tolerances help maintain ideal geometry between the valve seat and guide, reducing the amount of material removed during valve jobs while ensuring consistent chamber volumes. Made from C630 racing bronze, this guide contains 80% copper, 10% aluminum, and 5% nickel, offering excellent thermal conductivity, wear resistance, and corrosion protection. The high copper content improves heat dissipation, while the aluminum content makes it particularly compatible with aluminum cylinder heads. The guide's resistance to galling allows for tighter clearances, improving valve-to-seat sealing and oil control. A radius at the transition from the nose to the main body prevents galling during installation. This kit includes two intake valve guides unless otherwise noted.