Spark Plug Adapt 18MM TO 14MM Long Reach 4 Pack

If you are going to run an electronic ignition on your aircraft engine, you will need a set of these to adapt the 18mm spark plug threads in your aircraft cylinder head to 14mm threads for use of automotive spark spark plugs. These are the highest quality adapters you will find. These adapters are made on our in house CNC equipment. They are made from the strongest alloy of naval brass - The same alloy used to make propellers on large ships. You will find the thread tolerance and finish of these parts second to none. These adapters are included at no extra charge in our ignition and fuel injection kits.