How do these plugs look???

Budgetmoparman said
These are the spark plugs out of my 340 after about 300 miles of driving. How do they look to you guys? It runs great. I pulled the plugs so I could turn it over to adjust the valves and figured I would see what you guys think. Does it look lean, rich, right on? I'm not good at reading plugs. Thanks for any replies.

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From why I see...timing is about as good as it can get. Idle and cruise are about spot on. Can't tell about WOT because I need to see the bottom of the nose where it meets the shell. There should be a carbon ring down there about .100-.125 wide. If it is wider than that it is lean at WOT.

As far as heat range...if it's an NGK plug it's about right. If it's a Champion it's a range, maybe two too hot. If it's an Autolite...I'm guessing...but I'd say PFC to maybe one range warm.

If you want to cut the shell off and post some other pictures I can say more about WOT.

After that, you need a magnifying glass and patience to see if the timing curve is close and stuff like that.

Overall, I'd say your tune up is pretty damn good.