Mild 318 pinging

Frank,
This IS a stock engine in terms of spark plug requirements. You want the HOTTEST spark plug the engine will tolerate without causing pre-ign. NOT the coldest like some people think. Colder plugs cause misfires which apart from the hp & economy losses, puts more load on the engine, which in turn can cause pinging. Pinging is load related. Anyone ever hear of an engine pinging at idle?