When we think about spark plugs we usually only think about a couple of basic things like heat range,thread size and seat type. As it turns out there's a lot more to these little components than meets the eye.You can tell a whole lot about whats going on inside your engine and it's condition and how well it's doing its job of making horse power. I've attached another in a my series of long winded technical articles that tells you all about spark plugs and how to decipher the secrets that they hold.
Moose