318 Spark plug readers
Not a really good foto, these are from a stock '65 273 that have a lot of miles on them. The two on the top left of foto #1 and on the right of foto #2 show a lot of fuzzy, sooty, oily buildup. The other six (although difficult to see) are just a nice light golden brown. Stock motor with high mileage that I would not attempt to re-jet.