Ok thanks. One thing i do to my spark plugs is file the sides so there is a good sharp edge for the spark to arc to. I read it in a hot rod magazine. I dont know if it increases rpms or not, but it produces a nice clean spark which helps for easier starts and a better idle. I would show a pic, but my digital camera is buggered and i got to get a new one. I might do a diagram in paint to give a rough idea