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Old 01-07-2012, 05:21 PM   #1
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motor identification

Ok i have 89 mustang gt that i just got and am doing a tune up on it and discovered the spark plug replacements for that year dont match what came out of the engine. Turns out the 94 year looks like the same plug. Is there a way to tell the year an engine was made in case the original owners swapped engines?
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Old 01-07-2012, 05:48 PM   #2
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Yes there are ways but the 94 had a hotter ignition so sombody may have thought a hotter plug would be better how ever do not use a platinum plug it's a waste of money in a 5.0 as long as the gap is the same and they are all changed its good try it drive it till the next oil change pull the plugs and see if ther burning clean you can cross reference t nubers but they may have put a 94 top end on the block this is very common Fox body's are great I have a few but people usually won't leave them alone and they grab parts that they think will help when they build it to be honest I bout a 89 when I was 18 it came right off the lot aod auto and on slicks it would pull the front wheels do cross reference every thing get a old 302 block and build what you really want to tell you the best motor was a 86 roller cam you can gain more horses just bye carberating it

---------- Post added at 05:48 PM ---------- Previous post was at 05:44 PM ----------

If you need more info I'll give you my number I got free week ends
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Old 01-07-2012, 06:14 PM   #3
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Quote:
Originally Posted by 98prosnake5.4
Yes there are ways but the 94 had a hotter ignition so sombody may have thought a hotter plug would be better how ever do not use a platinum plug it's a waste of money in a 5.0 as long as the gap is the same and they are all changed its good try it drive it till the next oil change pull the plugs and see if ther burning clean you can cross reference t nubers but they may have put a 94 top end on the block this is very common Fox body's are great I have a few but people usually won't leave them alone and they grab parts that they think will help when they build it to be honest I bout a 89 when I was 18 it came right off the lot aod auto and on slicks it would pull the front wheels do cross reference every thing get a old 302 block and build what you really want to tell you the best motor was a 86 roller cam you can gain more horses just bye carberating it

---------- Post added at 05:48 PM ---------- Previous post was at 05:44 PM ----------

If you need more info I'll give you my number I got free week ends
94 top end is the same as the foxes, exception being the elbow on the upper intake.

---------- Post added at 06:14 PM ---------- Previous post was at 06:14 PM ----------

Quote:
Originally Posted by jacob.a.gasparp
Ok i have 89 mustang gt that i just got and am doing a tune up on it and discovered the spark plug replacements for that year dont match what came out of the engine. Turns out the 94 year looks like the same plug. Is there a way to tell the year an engine was made in case the original owners swapped engines?
You may have gt40 heads on your car, what's the part number on the plugs?
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Old 01-07-2012, 07:17 PM   #4
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That is all the writing on the spark plug that came out of the motor
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Old 01-07-2012, 07:52 PM   #5
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The gt40 plugs are longer.are yours to short?
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Old 01-07-2012, 08:09 PM   #6
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The 1994-1995 GT intake is very differant about 2inches shorter and a cast elbow it has shorter runners therfore the 15 HP differance between them and the fox bodys it uses the same casting as the thunderbird.
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Old 01-07-2012, 09:05 PM   #7
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The plugs advanced autoparts gave me for the 89 gt were about half an inch to three quarter inches short on the threads and these others i got had threads about 1.5-2 inches long. I dont know the exact length without taking them back out
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Old 01-07-2012, 09:16 PM   #8
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Quote:
Originally Posted by jacob.a.gasparp
The plugs advanced autoparts gave me for the 89 gt were about half an inch to three quarter inches short on the threads and these others i got had threads about 1.5-2 inches long. I dont know the exact length without taking them back out
Thread lengths vary for different brands. Did the new ones thread in ok?
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Old 01-07-2012, 09:43 PM   #9
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Quote:
Originally Posted by jacob.a.gasparp
The plugs advanced autoparts gave me for the 89 gt were about half an inch to three quarter inches short on the threads and these others i got had threads about 1.5-2 inches long. I dont know the exact length without taking them back out
Ask advanced for plug for a 95 cobra.If u ask slowstang nicely I think he has some info for identifying gt40 heads .they are very common upgrade and like already stated I think yours are gt40 heads.
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Old 01-07-2012, 10:07 PM   #10
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Ok I retract my state ment earlier now got new info from you thanks you have after markett heads take your valve cover off there are a couple of different brands more than likely it will say what brand right in under the valve springs This is good bro and you can build on this knowledge With the right cam and timing you sould be in the 8s in know time
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Old 01-07-2012, 10:16 PM   #11
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Alright i will definately take the valve cover off tomorrow and let you all know what i find.

---------- Post added at 10:16 PM ---------- Previous post was at 10:15 PM ----------

Also new ones went in great
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Old 01-07-2012, 10:21 PM   #12
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These are the markings if the heads are off a explorer After markett don't usually have this' but trick n flow is simalier
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Old 01-07-2012, 10:24 PM   #13
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Quote:
Originally Posted by jacob.a.gasparp
Alright i will definately take the valve cover off tomorrow and let you all know what i find.

---------- Post added at 10:16 PM ---------- Previous post was at 10:15 PM ----------

Also new ones went in great
If they fit it's not gt40 heads,
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Old 01-07-2012, 10:30 PM   #14
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What kind of plug wires or headers are on it? If you can grab some pics that would be great. I have gt40p heads on mine. Only way you can get by running them without melting your plug wires is to run (unless they are the cobra gt40 heads) 90 degree plug wires or get the Mac gt40 headers(may be others but Mac is the only ones I know) or redneck it and dent the hell out of your headers so they aren't touching the plug wires.
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Old 01-07-2012, 10:31 PM   #15
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Quote:
Originally Posted by 93slowstang

If they fit it's not gt40 heads,
They can fit but they will fail out quick the because they are not completely in the combustion chamber it will run but it will act like its about ten degess out of time because the fire and compression stroke will be off
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Old 01-07-2012, 10:32 PM   #16
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Quote:
Originally Posted by 98prosnake5.4

They can fit but they will fail out quick the because they are not completely in the combustion chamber it will run but it will act like its about ten degess out of time because the fire and compression stroke will be off
They wouldn't fit in mine.
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Old 01-07-2012, 10:39 PM   #17
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Quote:
Originally Posted by dreamstang

They wouldn't fit in mine.
Gt40plugs won't fit in stock heads they are deeper His plugs are to short so he has a modified top end
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Old 01-07-2012, 10:40 PM   #18
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Quote:
Originally Posted by 98prosnake5.4

They can fit but they will fail out quick the because they are not completely in the combustion chamber it will run but it will act like its about ten degess out of time because the fire and compression stroke will be off
Gt40p heads use a longer/skinnier spark plug, the regular foxbody 5.0 plugs won't screw in.
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Old 01-07-2012, 10:40 PM   #19
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I meant e7 plugs wont thread in gt40s.
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Old 01-07-2012, 10:42 PM   #20
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Quote:
Originally Posted by 98prosnake5.4

Gt40plugs won't fit in stock heads they are deeper His plugs are to short so he has a modified top end
For reference the plugs are the same between gt40 and gt40p, they wouldn't even thread into the e7's.

---------- Post added at 10:42 PM ---------- Previous post was at 10:41 PM ----------

Quote:
Originally Posted by 90mustangLX
What kind of plug wires or headers are on it? If you can grab some pics that would be great. I have gt40p heads on mine. Only way you can get by running them without melting your plug wires is to run (unless they are the cobra gt40 heads) 90 degree plug wires or get the Mac gt40 headers(may be others but Mac is the only ones I know) or redneck it and dent the hell out of your headers so they aren't touching the plug wires.
I'm running msd 8.8 wires with the straight boots on them, except for the #7 cylinder. Using bbk shorties.
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Old 01-07-2012, 10:47 PM   #21
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Quote:
Originally Posted by 93slowstang
I'm running msd 8.8 wires with the straight boots on them, except for the #7 cylinder. Using bbk shorties.
I'm running the same headers but I went with the MSD 90 degree plug wires cuz I kept melting the one within 10 minutes of running.
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Old 01-07-2012, 10:48 PM   #22
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Quote:
Originally Posted by 93slowstang

For reference the plugs are the same between gt40 and gt40p, they wouldn't even thread into the e7's.

---------- Post added at 10:42 PM ---------- Previous post was at 10:41 PM ----------



I'm running msd 8.8 wires with the straight boots on them, except for the #7 cylinder. Using bbk shorties.
When I got mine it had 90* boots.now I have straight booted accel super stock wires.I have summit shorty headers.I have the same prob as u.my boots on my wires are rated for 450*.on they #7 I used a fiber glass sleeve.but I will say the previous 90s had better clearance just not neccesary.
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Old 01-07-2012, 10:53 PM   #23
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Quote:
Originally Posted by 90mustangLX

Gt40p heads use a longer/skinnier spark plug, the regular foxbody 5.0 plugs won't screw in.
Yes but there are a few that will gt40s are the same thread they came on 92-94 ford f150 they also could be windser heads that re modified
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Old 01-07-2012, 10:53 PM   #24
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Quote:
Originally Posted by 90mustangLX

I'm running the same headers but I went with the MSD 90 degree plug wires cuz I kept melting the one within 10 minutes of running.
I melted several sets, got tired of buying new wires so I put my straight ones back on. Put a 90 on #7 and put a sleeve on it to keep it from melting. No problems yet and they've been on for almost a year now.
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Old 01-08-2012, 05:25 AM   #25
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Re: motor identification

I had a similar problem on the 95 Mustang I used to own.
Someone had put gasketed seat plugs in a head designed for angled seat plugs.
Luckily it had Edelbrock Performer heads on it so it was as easy as looking up the plug specifications for that head to determine the correct plugs.

You need to find out what heads you have for sure and determine the seat type and plug thread length they require for the engine to perform properly and safely.

Too short a thread length and they will likely come loose and back out and they move the flame kernel back into the head too much, so it may have difficulty igniting the fuel mixture properly.

Too long and you run the risk of the piston hitting the end of the plug because it protrudes through the head and into the cylinder.
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Old 01-08-2012, 09:02 PM   #26
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Re: motor identification

Facebook

I couldn't really figure out how to get pics up on here but I took a bunch of pics and uploaded them to my facebook. Hopefully this all works.
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Old 01-08-2012, 09:31 PM   #27
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When you reply to thread click the + symbol and should have a option to get pics from your phone... Least that's how mine works
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Old 01-08-2012, 10:13 PM   #28
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Old 01-08-2012, 10:13 PM   #29
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The plug on the right came out of my car the one on the left is for a 89 gt
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Old 01-08-2012, 10:24 PM   #30
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Looks like the old one wasn't even sealed. What was the previous owner thinking?
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Old 01-09-2012, 10:14 PM   #31
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Does anyone have any ideas from the pics i posted
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Old 01-10-2012, 01:15 AM   #32
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Re: motor identification

Quote:
Originally Posted by jacob.a.gasparp View Post
Does anyone have any ideas from the pics i posted
No, but you should be able to look down into the spark plug hole and use a thin tape measure to determine the proper thread length.
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Old 01-10-2012, 07:29 AM   #33
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This may be a stupid question but is there a spot on the motor itself to identify the year produced? The heads hqd the ford logo on them as seen in the pictures.
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Old 01-10-2012, 10:04 AM   #34
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This may be a stupid question but is there a spot on the motor itself to identify the year produced? The heads hqd the ford logo on them as seen in the pictures.
Gt40s are Ford heads so that still doesn't help.there is a spot I believe toward by back on passenger side maybe.but referencing the motor won't tell if you have e7s or gt40s

---------- Post added at 10:04 AM ---------- Previous post was at 10:03 AM ----------

Check in the stickies section.there is good info for identifying .
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Old 01-10-2012, 12:20 PM   #35
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You would have to pull a head to identify an e7 head, the gt 40s and gt40p heads have it stamped by the rockers. Here's what you would see for gt40p heads.
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