Originally Posted by
gentleman81
will any plugs change the tapper of the button head, and make it so u can only run that plug? i have used the o'donnel and os. i would like to get one plug and stick with it
The taper is like you already know the shape of where thew plug seals. So the plug you put in needs to meet the degree of angle. Nova plugs have a shallower taper and they will not seal right and distort the taper. You do not want to do this. You can run the OS as they have the same taper and also the picco and the sirio plugs as well. They all share the same. The Odonnell if it fits in thew OS which I do think it does will fit and you can run them. But you may see a difference in the way the engine runs with the different plugs though. Hope it answers the question. And for the price the Euro is way high and the yen and such is still a bit lower. That is why they are so much different in price.