These are the best images I can offer with my aging digital.

All four plugs have electrodes rounded over on one side only. Although the plugs are mostly a nice tan color the insulator is lighter in color where electrode is rounded over. There is also a VERY slight glazing on the rounded over electrodes. It's as though 1/2 of each plug is perfect in color and condition and the other 1/2 has been over heated?????

1) Plugs have 10k miles on rebuilt motor.
2) I've checked timing again and again.
3) I have run on 87 fuel with no indication of pinging.
4) With my MPG I don't see how she could be lean!
5) EGR was prolly NOT working until very recently (Thanks, Darin the bvsp valve is working great).
6) NGK BPR5EY
7) Cooling and lubricating systems give every indication t/b in excellent working order.

Comments/observations, please.