Hack Engineering high precision bronze Colsibro valve guide, suitable for Suzuki G13BB engines (may also fit others).

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.

10.59mm O/D. Priced per guide, suitable for both intake and exhaust use.

*guides pictured are not actual product