Does anyone have any pictures showing what various spark plugs will look like w/ leaded gas? I know how to tell what a spark plug has been seeing on unleaded, but on leaded you get that light silver coating on the plug. Is it possible to tell what a plug has been seeing w/ leaded gas at all? I'm mostly interested in what a knock prone plug will look like w/ leaded gas. To my eye my plugs looked PERFECT after pulling them. However I want to make sure.

Thanks!

 

metallic spots on porcelain don't change THAT much with unleaded vs leaded

That's the main thing I look for re: detonation