KPMI, intake valve guide. Manganese. +.001"

Manganese bronze. Softer and less durable then C630 bearing bronze but will allow a lower cost and reaming to size is quick and easy. Finish can be done with simple tools like a ball hone and an electric drill. Rapid heat transfer and excellent lubricity. Note: Special Manganese reamers & hones are available. Note: Standard non-oversize dimensions (for reference only) are 0.5620" O.D. (14.27mm); 0.2750" I.D. (6.99mm); 2.02" OAL (51.31mm).

Fits: > 05-17 Twin Cam; 04-21 XL Sportster; 08-12 XR1200; 03-10 Buell XB (NU)