LM97Z

iTrader: (4)

I know the pix aren't the best, but do they look good, the porcelin is white, no peppering, the ends of the threads are dark (almost black) & lighly fluffy, the straps look like the timing is close, these plugs have about 150 miles on them, too me they look almost perfect.

Revelation Z28

iTrader: (10)

looks like they were running a little hot from the straps being whiteish

MadMike 97 Z28

iTrader: (3)

need close ups of the electrodes.

LM97Z

iTrader: (4)

I ment to say something about that, there not white, its just the lighting, if you look at the 1 pic, it shows them better, the tip is light gray, then goes to a deeper gray around the bend, the botten area is med. tan, its actually showing 4 shades of color on the straps, there the NGK TR55GPs, they are gapped at like .055" or so. The engine has 157K on it.

Revelation Z28

iTrader: (10)

if they are gray and the insulation below the iridium tip is still clean then its probably running a close to perfect A/F.

Nostang

iTrader: (4)

You should read the plugs by looking down into the plug where the porcelin meets the base of the plug for more accurate readings. Also, unless you were at full throttle on that run and shut it down the plugs will be biased to the idle mixture right before you shut the car off.