The V-Twin 11-0732 EX Valve Guide is a vintage cast iron part designed specifically for Harley-Davidson motorcycles from 1936-1947. This .001 oversize NOS valve guide is compatible with Knucklehead models, adding a touch of authenticity and quality to your bike's engine. Produced by V-Twin Manufacturing, this valve guide ensures a smooth and reliable operation for your motorcycle, making it a valuable addition to any vintage Harley-Davidson enthusiast's collection.