redbird555

iTrader: (14)

Just finishing up my header swap and I accidentally cracked one of the plugs so I decided to just pull then all and check em. I think they look ok they only have 10k on them so I think I'm just gonna replace the one. The electrodes all look good and. I think the burn looks like a good color also. Just wondering opinions?

RPM WS6

iTrader: (3)

They look good to me.

TransAmBlue

Look good except the cracked one. hehe

redbird555

iTrader: (14)

thanks guys ya i've never been real good at eyeballing burn colors haha i know tan is good which is what i kinda have and black is pig rich.... whats running lean look like on the plugs?

TransAmBlue

Melted white porcelin around the electrode. Unleaded gas is harder to read the plugs they will look very white with unleaded.

redbird555

iTrader: (14)

ok i gotcha, the car put down 390 on a mustang dyno before the new 1-7/8 lt's and i drive the **** outta it so i think its doing ok lol

TransAmBlue

My 99ta had a lean tune in it, melted the porcelin but it was super quick until number 7 piston decided it wanted to leave through the exhaust.

Actually all that you are reading on your plugs is burnt oil...that aint from unleaded gas.........thats the small amount of oil you are burning coloring the porcelin.

Unleaded fuel just doesn't color the plugs unless its pig rich and then they turn black and foul.