These guides are finish ground and made to size required to order, so there will be usually a 1-5 day delay from date of order before they are depatched..
+0.010 inch (0.25mm) over Standard size Exhaust valve guide Colsibro material, fits Cast iron and alloy heads 5T 6T T100 T110 T120 Pre-unit and Unit T120 TR6 cylinder heads 1959 to 1972
Valve guide measures 0.5115 inch (12.99mm) diameter.
Colsibro material is a copper nickel silicon alloy, and is second to none as valve guide material. Has high wear resistance and heat conductivity, and the lubricity prolongs valve stem life, if used with our Plasma hardened valves makes the best combination for longevity service life.
Valve guide after fitting to cylinder head must be honed to ensure correct valve stem to valve guide clearance.
Note valve guide sizing, Triumph twins cylinder head guide hole is 0.500inch (12.70mm) so standard valve guide is 0.0015 inch larger (0.04mm) Check valve guide hole and if you need oversize valve guides, see our oversize guides listed.
