Racetorations Colsibro Valve Guide Set – TR5-6

Colsibro valve guide set suitable TR5-6 engines with 5/16" valves.

Colsibro is a high-copper alloy with small additions of nickel and silicon, which combine to increase the strength, hardness and wear resistance of the material. The material is vastly superior to phosphor bronze in this application. It is resistant to galling or nipping up in arduous working conditions.