KPMI, exhaust valve guide. C630 bronze. +.004"

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. 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).

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