Brand New Genuine COLSIBRO® Valve guides for engine types


Not to be confused with cheaper bronze guides which are a lighter colour, these are a silicon copper alloy

As supplied by ourselves to many top engine builders.

Colsibro® is a precipitation hardening copper nickel silicon that offers a remarkable blend of physical and mechanical attributes unrivalled by many other grades of copper alloy. It is widely specified for use in high performance automotive and motorsport engine components including valve guides & valve seats.

Almost half the friction compared with OE cast iron ones and twice the thermal conductivity

Simply the best valve guide material for high performance engines