KIBBLEWHITE C630 Valve Guides — Oversize +0.001, 1.770" length, 0.3085" ID, C630 Bronze – 57-83 Sportster

Precision-machined from copper-based nickel-aluminum bronze for excellent wear resistance and long service life.

Compatible with no-lead fuel and designed to accept a wide range of valve-stem materials, providing maximum service when used with chromed valve stems.

The tapered nose profile minimizes port obstruction and improves flow characteristics for better engine breathing.

Designed to accept top-hat valve seals (sold separately) and standard lower collars; finished for reliable, service-oriented fitment and made in the USA.