99181-4 Valve guide seal set. Viton 4-pk

If your vintage Big Twin is starting to puff a bit of smoke on startup, it might be time for a fresh set of valve guide seals. This Manley set includes four high-quality seals featuring spring-loaded Viton wipers, designed to provide maximum oil control in the demanding environment of a Harley-Davidson cylinder head. These seals are a great addition to any top-end service, helping to keep your combustion chamber clean and reducing oil consumption. They are designed for a perfect fit on 1948 to early 1979 Big Twin models. Just keep in mind that you will need the proper installation tool to get them seated correctly. It is a simple but effective upgrade for maintaining the health of your engine.