etbaseball3b

hey guys. about 6 months ago i bought a supercharged 95...the car was dyno tuned...and i got the car and noticed there was detonation. just today i changed the plugs....it had autolite 63s....which i have never seen on a mustang EVER...and they were gapped at .60.....i put in autolite 3923's ...gapped at .35...no detonation...

has anyone ever even used the auotlite 63's?

Drive85mustang50

My Dad allways used Autolight in his 68 mustang 302. I use them in my 85 302. they are great plugs .32 is the right gap for the plugs

NegadivOne

i just bought autolite plugs and the guide said the right gap is .054

etbaseball3b

i know autolites are good plugs....but my question is about them being 63's.....all my buddies w/ mustang run autolite's....but they said they have never even seen a mustang w/ autlite 63's

stanglx2002

i have never heard of 63's before i run 25's in my car at .50 gap and i have no problems ever

angcobra

Are you running cast iron heads or aluminum heads?
For supercharged application you run colder plugs with smaller gap. Colder to reduce detonation, smaller gap to keep boost from blowing out spark.
For my Alum heads I use 3923
For my cast heads I use 23

etbaseball3b

yeah i have aluminum heads..i kno supercharged goes w/ a colder plug, i always ran 3924's in my other mustangs, so i put 3923's in mine...took away sll the detonation problems and it runs like a new car...i picked up an easy 2 tenths by changin to these plugs....should be down around 11.5 - 11.6 now

but the autolite 63's aren't even a 5/8s plug...they are 13/16ths.....these plugs are way off