9FF ENGINE CASE BORE PLUG SETQuit using shop towels to cover up case bore openings. Foreign material that gets into your bottom end can cause major damage, using a shop rag can inadvertently introduce these contaminates. Step up your engine building game! The Engine Case Bore Plug Set is designed to keep foreign materials out of your cases while working on them. Magnets help hold the plugs together ensuring they stay in place. Multiple options allow use on all models from