My spark plugs dont fit the GT40 heads

[BaBiLuTH]

Hey, I am about to install gt40 heads on my 88 GT and have a small problem. I tried to swap the spark plugs from the old head to the GT40s and the plugs dont fit. Does anyone know what year and/or model mustang plugs I should use for this. Im I dont need anything fancy for the plugs, just something to get me going for now. Thank you.

 

[Look Its Aaron]

What gt40's are they. The reguar gt40 irons? gt40p's gt40 y's?

 

[dragnazz5.0]

autolite 3924's i think are the correct one. go to the parts store and ask for plugs for a 98 explorer with a 5.0 and they should be the same ones.

 

[Grn92LX]

I beleive gt40 iron's take an autolite 764. They do not use stock plugs from an E7 head.

 

[BaBiLuTH]

I have regular Iron GT40s

 

[Mustang5L5]

Autolite 764's.

EVery GT-40 version uses that plug. It's the same plug as the 4.6L Mustang as well

 

[BaBiLuTH]

So the autolites are for what car? What do I ask for when going to the parts store??

 

[Mustang5L5]

1993 Mustang Cobra

 

[Euphoric306]

id love to go into a parts store and ask for any part to that car hehe

i kinda have a moment of pride when they ask me the 4 cyl or 302 and i say its the 5.0


one time she automatically went to 4cyl so i picked up the monitor and smashed it over her head


haha jk, but yea, good luck with teh plugs

 

[v8only]

the 764 is the same plug for the explorers. Don't even look it up on their monitor, just tell them to grab you 4-764 plugs.....jk 8 -764 plugs

 

[Desperado]

ask for the plugs for a 93 or 94 mustang cobra. motorcraft plug should be the asf32 i believe. but i ask for 94 cobra plugs when i go in and that it what i get and they work great

 

[dragnazz5.0]

yep, you guys are right....the 3924s are plugs for aluminum heads

 

[Jarhead67]

Hey, I am about to install gt40 heads on my 88 GT and have a small problem. I tried to swap the spark plugs from the old head to the GT40s and the plugs dont fit. Does anyone know what year and/or model mustang plugs I should use for this. Im I dont need anything fancy for the plugs, just something to get me going for now. Thank you.

1996 explorer plugs

 

[Jarhead67]

1996 explorer plugs

I use motorcraft copper plugs SP447A

 

[02 281 GT]

Phew. After seventeen years, he can finally get his heads installed.

 

[7991LXnSHO]

Related to this zombie thread are the plugs I just got for my E-7 heads. I ordered AC Delco Copper core plugs, and I expected them to be reboxed Denso plugs. Nope.

They are made in China, with a black oxidized finish. They look well enough made, but I’m definetly using anti seize and checking gaps.
I’m not sure where to get new plugs made in the US or Japan anymore.

 

[Adieu]

Related to this zombie thread are the plugs I just got for my E-7 heads. I ordered AC Delco Copper core plugs, and I expected them to be reboxed Denso plugs. Nope.

They are made in China, with a black oxidized finish. They look well enough made, but I’m definetly using anti seize and checking gaps.
I’m not sure where to get new plugs made in the US or Japan anymore.

NGK makes their plugs in Japan still. I run them in ESP and the 4Runner exclusively.

Delco and Motorcraft are relabeled Autolites, which are made by Honeywell, hence the Chinese manufacturing.

 

[02 281 GT]

I see a lot of NGK branded plugs on Amazon with bad reviews saying they received knockoffs. I might be tempted to say that I would only buy them at the dealership at this point. Knockoff parts are a serious problem these days.

 

[Adieu]

I see a lot of NGK branded plugs on Amazon with bad reviews saying they received knockoffs. I might be tempted to say that I would only buy them at the dealership at this point. Knockoff parts are a serious problem these days.

I get mine from the local parts store or Rock Auto to avoid that.

 

[Mustang5L5]

Amazon has a ton of fake automotive parts these days. Lots of fake motorcraft and AC delco stuff as well as other brands