C630 bearing bronze. Standard size: 0.5620″ O.D. (14.27mm); 0.3090″ I.D. (7.85mm); 2.00″ OAL (50.8mm). C630 bearing bronze is a tough nickel-aluminum-bronze alloy typically used in High Performance and racing applications where rapid heat transfer from the valve to head is important.
KPMI, intake/exhaust valve guide. C630 bronze. STD
€52.80
84-99 Evo Big Twin; 99-04 Twin Cam; 86-03 XL Sportster (NU)