7627-4 O-ring manifold conv. Nipple kit

This Colony o-ring manifold conversion nipple kit is a high-quality solution for riders looking to improve the intake sealing on their vintage Knucklehead or Panhead. These aluminum nipples are a weld-in type, designed to convert your heads to the more modern and reliable o-ring style manifold connection. This kit fits 1940 to 1954 Knucklehead and Panhead models. By moving away from the older plumber-style seals, you can significantly reduce the chance of air leaks and ensure more consistent engine performance. It is an essential upgrade for any serious engine builder working on these classic Harley-Davidson powerplants.