Originally Posted by Sniper
Perfectly white is lean. You want a light tan or reddish brown and you should be able to see the "fire ring" about halfway down on the center electrode .

This one is a touch lean but you can see the ring towards the top of the electrode, it's a range too hot, should be pretty close to centered up/down.

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I strive to get that exact look on all my engines up Lean is mean grin scope
I would like to see the other side of the ground strap as well as look down in the plug to see more of the insulator and what it looks like also before saying that it is perfect on all aspects of the tune up twocents
Timing, jetting and spark plug heat range all need to be correct to get the motor to make the most power and economy at idle, light throttle cruise and at WOT.
The old saying about the light tan look on spark plugs was made back when we had lead additives in all gasoline work
Not so now whiney

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)