Kibblewhite Valve Guide Bronze Exhaust Oversize Harley-Davidson

Kibblewhite bronze exhaust valve guides are precision-machined replacement valve guides for Harley-Davidson engines. They suit engine rebuilds and repairs where the original guide bores are worn. The oversize outside diameter restores a tight fit in the cylinder head. This line is made from C630 bronze, also called nickel-aluminum bronze.

Key Features:

• C630 bronze construction: This alloy blends copper, nickel and aluminum. The high copper content gives excellent heat conductivity. The nickel adds wear resistance, and the aluminum adds work-hardening characteristics.
• Tight clearances and good sealing: C630 bronze allows tighter guide-to-stem clearances than many other materials. This supports better valve and seat sealing and better oil control.
• Compatible with aluminum heads: The expansion characteristics of C630 bronze make it well suited to aluminum cylinder heads.
• Valve stem and fuel compatibility: These guides work with no-lead fuel and accept any type of valve-stem material.
• Airflow-conscious design: The guide profile is designed to have minimal effect on the airstream. It keeps the thickness needed in high-temperature areas.
• Seal compatibility: These guides are machined to accept OEM-style valve seals.
• Exhaust application: These are exhaust-side guides. Oversize (repair-type) guides are offered for worn guide bores.
• Made in the U.S.A.: Each guide is machined to Kibblewhite Precision Machining (KPMI) quality standards.

Kibblewhite Precision Machining is a long-established valvetrain manufacturer. It supplies the motorsport industry and select OEMs. These guides suit both stock rebuilds and performance builds. Also known as an exhaust valve guide or oversize valve guide.