Don't forget the length of the plug matters too... Cause if the plug is to long, then the piston will slap the plug. And if you do that, you're gonna have a bad time.tracksidetuning wrote:Plugs are not designed for a specific motor. Check the part numbers. There is no such thing as a "KA plug". If it fits in the motor and it creates a spark then it will run your car. Heat range and material used in the plug are really the only difference.
even the bkr5s are to hot of a plug.. for stock boost either use bkr6es and if your going to be boosting higher then 12 use bkr7es to be in the safe zone..and don't gap the plug higher then 0.32aznrib wrote:Dont run the KA plugs. Get some NGK bkr5e for stock boost setup. For 14 psi, some run NGK bkr7e. Gap to .28.