I've Been A Bad Boy...

[joshjwc9]

I've neglected to change the plugs on my Stang here. I've been supercharged and have gone more than 12k miles on the copper Autolite 103's that are in it. Seeing maybe 16.5 mpg city and only 21 on the highway. Car still runs good, but it will run better with different plugs, I'm very sure of that.

I'm tempted to just go get 8 more 103's, but want to know if switching the the Motorcraft sp505's are any different, or if the difference between the half thread design old Motorcrafts and new full thread design will throw anything off detonation wise.

Someone better give me what I got coming my way.. (all women come to the front of the line please..)

 

[trinity_gt]

If it's not misfiring now changing plugs won't likely change much but it's probably a good idea to swap 'em anyway. Just make sure you get the correct heat range.