KPMI, exhaust valve guide. Manganese bronze. +.004"

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. Finish can be done with simple tools like a ball hone and an electric drill. Rapid heat transfer and excellent lubricity. Note: Standard non-oversize dimensions (for reference only) are 0.5650" O.D. (14.35mm); 0.3760" I.D. (9.55mm); 1.880" OAL (47.75mm). Note: Special Manganese reamers & hones are available.

Fits: > 48-65 Panhead; 66-78 74" (1200) Shovel (NU)