Saturday, 6 October 2012

New Kibblewhite guides and valves for Harley-Davidson® Flathead 1930 to 1948

 New Kibblewhite guides and valves for Harley-Davidson® Flathead 1930 to 1948

 New Flathead Guides and Valves

For years, we’ve made custom flathead components for builders restoring and racing these engines. Now, we have the most popular valves and guides on the shelf, ready to go. The One Piece forged KPMI Black Diamond™ valves made from 21-4N stainless, with their hard, smooth surface finish, are particularly well suited for the high temps and poor oiling that exist in the top ends of these engines.

These valves are fully machined and held to the same tight tolerancing as all KPMI valves. KPMI cast iron guides are a perfect match for these engines. Made from our proprietary cast iron blend, and held to tight ID, OD and concentricity call outs, their dense, fine grain, granular structure gives excellent wear characteristics and allows for a superior bore finish. 

Black Diamond™ Valves for Harley-Davidson® Flathead

All KPMI Black Diamond™ stainless steel valves are impregnated by a special German process to a depth of .002”, with a surface build up of .0002”. This “Black Diamond™” process improves wear properties, reduces friction, and provides resistance to corrosion and wear that is superior to chrome and nickel electrolysis plating. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench. Black Diamond™ Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics.


   Valve Guides for Harley-Davidson® Flathead™

After chemically separating several samples of cast iron material for analysis and evaluating the test data, we decided to have our own specification of cast iron made exclusively for us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfur to produce a highly pearlitic structure with dense fine grains for excellent wear resistance.


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