Kibblewhite Manganese Bronze Valve Guides Harley Shovelhead

Kibblewhite manganese bronze valve guides are precision-machined replacement engine valve guides (also called valve guide inserts) for Harley-Davidson Shovelhead engines. They are made in the USA by Kibblewhite Precision Machining (KPMI). They suit stock rebuilds and home-built engines, and they are a budget-minded alternative to premium nickel-aluminum bronze guides.

Key Features:

• Manganese bronze construction: The material is softer than nickel-aluminum bronze, so the guides are easy to ream.
• Simple finishing: You can ream the guides with a battery-powered or electric drill. Finish them with a quality ball hone. This avoids the expensive honing equipment that nickel bronze guides require.
• Heat conductivity: The bronze alloy conducts heat well, which supports long valve life.
• Tight tolerances: The guides are precision machined. They hold high concentricity between the valve seat and the guide.
• Seal compatibility: They are machined to accept OEM and aftermarket valve stem seals.
• Airflow-minded profile: The guide shape is designed to disturb the air stream in the port as little as possible.

Several size options are available within this product line. Choose the variant that matches your engine build and machining plan.