Compression Release Hole Plug

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Compression Release Hole Plug for Harley-Davidson covers the threaded plugs used when blanking off compression release bosses on S&S cylinder heads fitted to Harley-Davidson engines. Iron City Motorcycles is an authorised Harley-Davidson dealer in Leeds, and we stock S&S plugs as part of our broader engine parts range for Sportster, Dyna, Softail and Touring Harley-Davidson builds. If you have removed a compression release — perhaps because a new ignition setup no longer requires it, or because you are running a different cam profile — the exposed hole needs a properly-sealed, correctly-threaded plug to keep combustion gases and oil where they belong. These S&S plugs are the right answer for any S&S-headed Harley-Davidson engine. Browse the full range below.