Kibblewhite 20-30HSM Bronze Valve Guide Exhaust +0.025 Harley Panhead Shovelhead

The Kibblewhite 20-30HSM is a premium manganese bronze exhaust valve guide designed for Harley-Davidson Panhead and Shovelhead 74 cubic inch engines from 1948 to 1977. This oversized guide features a +0.025" outer diameter for precision fitting in worn or machined cylinder heads.

Premium Material Construction:

Manufactured from C63000 nickel-aluminum bronze alloy, this guide delivers exceptional performance in high-temperature exhaust applications. The copper-based alloy contains approximately 5% nickel for superior wear resistance and 80% copper content for outstanding heat conductivity, ensuring long service life and consistent performance.

Key Features:

• C63000 nickel-aluminum bronze construction for extreme durability
• +0.025" oversize outer diameter for worn guide bore repair
• KPMI profile design minimizes airflow restriction
• Optimized wall thickness in critical high-temperature zones
• Enhanced heat dissipation for reduced valve stem wear
• Direct replacement for Harley-Davidson Panhead and Shovelhead engines

Kibblewhite's KPMI valve guide profile maintains critical cross-sectional thickness in high-temperature areas while minimizing interference with the intake and exhaust airstream. This engineering approach promotes both high performance and extended component endurance in demanding applications.