Koflach Engine Developments high precision bronze Colsibro valve guide, suitable for BMW S50B30 (Euro) engines. Colsibro is a high tech precipitation hardening copper nickel silicon, as used in premium engines across the world at all levels. These valve guides offer lower friction and better wear qualities than standard valve guides. 12.13mm O/D, suitable for 7mm valve stems. Priced per guide, suitable for both intake and exhaust use – replaces BMW part number 11121315999, which is no longer available. *guides pictured are not actual product
