KPMI, intake/exhaust valve guide. Cast iron. STD

29-73 45" (750cc) Flathead (NU)

Cast Iron. Standard size: 0.5647" O.D. (14.34mm); 0.3395" I.D. (8.62mm); 2.800" OAL (71.12mm). Cast iron offers maximum durability and wear resistance for long distance touring. The standard since the invention of the piston engine.