what heads are on my car? 1988 Mustang GT

vert · 10-21-2007

i just bought a 88 5.0 gt. i went and bought all the tune up stuff( coil, cap, rotor, plugs, and wires) well the plugs were not even close to being long enough. so i took them back. they were the right plugs for the 302 5.0 out of a 88 mustang. the closest thing we could find to match my plugs were cobra plugs. the model i pulled out of my car were discontinued. so how do i find out what kind of heads are on the car?

FoxChassis · 10-21-2007

The brand name and part number of the 'old' plug is ???

Cobra (GT-40) heads will have a "GT" near the #1/#8 spark plug boss and three bars on the front and rear.

vert · 10-21-2007

the plugs in it now are autolite 764

**EagleAutosports** · 10-21-2007

Those 764's are meant for 1993-1995 Cobra heads. If they're actual Cobra/GT40 heads, you should be able to pull a valve cover off and see "GT" cast into the head between the center valve spring recesses.

vert · 10-21-2007

i know the plugs meant for the 88 5.0 mustang are so short they wont even tread into this head. i guess i lucked up and got cobra heads. i did not see the three lines or the gt stamp by the plugs. excuse my ignorance buy which plugs are #1 and #8, and are the 3 lines in a visable spot without pulling things apart?

**EagleAutosports** · 10-21-2007

The 3 grooves/lines should be visible from the front of the engine, they'd be on both ends of the heads. What is the angle to the plugs, angled like normal or almost straight? I mean in relation to the header tube.

vert · 10-21-2007

they are angled slightly up and forward.

FoxChassis · 10-21-2007

Standing in front of the car an looking at the engine bay, cylinder #1 is in front and to the left and #8 is in the back and to the right.

vert · 10-21-2007

im still confused, i dont see the three lines, but my car has cobra plugs. the gt plugs will not even thread into my head.

**EagleAutosports** · 10-21-2007

Well they're not GT40 heads, for sure. Do you see any numbers at all on the heads anywhere?

FoxChassis · 10-21-2007

E6SE heads use the same plugs as GT-40 heads.

vert · 10-21-2007

E6SE heads from a 86, wasnt that a carbed engine. why would some one put the heads off of a old carbed 302 on a newer fuel injected 302

FoxChassis · 10-22-2007

'86 was SEFI, same as '88, and had the exact same shortblock as '88 too