Precision C630 Guide, Int/Exhaust +0.010

• Type: Valve Guide

The Precision C630 Intake/Exhaust Valve Guide (+0.010) is engineered for high performance and durability. Designed to optimize airflow, these guides feature a streamlined profile that minimizes obstruction while maintaining critical thickness in high-temperature areas. In many cases, simply installing the guides enhances airflow without additional modifications. The guides incorporate a flange or diameter reduction for precise protrusion, ensuring proper seal-to-retainer clearance for aggressive cam profiles without repeated measurements. Tight concentricity tolerances maintain optimal geometry between the seat and guide, reducing material removal during valve jobs and ensuring consistent chamber volumes. Constructed from C630 Racing Bronze, which contains 80% copper along with nickel and aluminum, these guides offer excellent thermal conductivity and resistance to galling. The high nickel content enhances hardness, wear resistance, and corrosion resistance, making them ideal for use with modern pump and performance fuels. The aluminum content ensures compatibility with aluminum cylinder heads. A radius at the transition from the nose profile to the main body helps prevent galling during installation. Each kit includes two valve guides unless otherwise specified.