KPMI, intake valve guide. Manganese. STD - 79-84 80" (1340cc) Shovelhead (NU) 900843 Easy selection by a rotary

Easy selection by a rotary switch on the ignition unit

Note: There may be more differences in Harley-Davidson crankcases than you might think

Will even mount upside down

but modern 4-piston engineering is used

KPMI, intake valve guide. Manganese. STD - 79-84 80" (1340cc) Shovelhead (NU) 900843 Easy selection by a rotaryMaganese bronze. Standard size: 0. 6250" O. D. (15. 88mm); 0. 3745" ID (9. 51mm); 1. 91" OAL (48. 51mm). Manganese bronze is softer and less durable then C630 bearing bronze but will allow a lower cost and reaming to size is quick and easy and finish can be done with simple tools like a ball hone and an electric drill. Rapid heat transfer and good lubricity. Note: Special Manganese reamers & hones are available.