87 Mustang Engine Differences - Mustang Evolution

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Old 10-12-2012, 09:16 PM   #1
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87 Mustang Engine Differences

What kind of motor is in a 87 foxbody GT? The 302 HO? And what years will fit in it without changing anything?
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Old 10-12-2012, 09:32 PM   #2
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Yup 5.0 ho. 86-93 are all the same except the 86-88 cars are speed density and not mass air. With the exception of the California '88's which were mass air
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Old 10-12-2012, 09:38 PM   #3
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Yup 5.0 ho. 86-93 are all the same except the 86-88 cars are speed density and not mass air. With the exception of the California '88's which were mass air
would a mass air work my car?
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Old 10-12-2012, 09:46 PM   #4
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There is no difference between the mass air motors and the speed density ones. If you want to convert you car to mass air, which is highly recommended, you will need the mass air computer, mass air sensor, intake pipe and filter. There is the A9L computer which is for manual transmission cars and A9P for auto's. Iv heard it doesnt matter which one you get and iv also heard it does. I did the swap on my 87 5 speed with the A9L with no problems and my cousin did his 86 5 speed with the A9P with no problems.
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Old 10-12-2012, 09:56 PM   #5
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The only other difference is 86 had flat top pistons from the factory. Either processor will work for a five speed. You will need to add two wires to the PCM connector, tap a power and a ground and install the sensor.
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Old 10-12-2012, 09:58 PM   #6
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The only other difference is 86 had flat top pistons from the factory. Either processor will work for a five speed. You will need to add two wires to the PCM connector, tap a power and a ground and install the sensor.
You sure it was 86? I thought 85 had the flat tops?
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Old 10-12-2012, 09:59 PM   #7
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Yup my last fox was an 86 GT. 85 had diff heads.

---------- Post added at 09:59 PM ---------- Previous post was at 09:58 PM ----------

Course it only really matters if you run a huge cam or really small heads.
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Old 10-12-2012, 10:04 PM   #8
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Ahh gotcha. Also there are two wires in the connector that need moved to different locations. There is a write up in the useful info sticky that will show you everything you need to know
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Old 10-12-2012, 10:09 PM   #9
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We just talked about this at work lol. I used to have 100's of EEC-IV PCM connector pins. Wish I still had that fox.
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Old 10-12-2012, 11:33 PM   #10
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Oops double post...
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Old 10-12-2012, 11:38 PM   #11
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IIRC the speed density had a little bit different cam (at least 48 state cars did). Also if you're looking fir new pins your local dealer "may" have them. I did a IAT sensor mod on a Ranger I had and the local dealer had them. Also there's a few places online. I've used one before fir all kinds of goofy stuff like that. I found the Xmas trees for door panels fir my 93 and SVO, as well as a neighbors Dodge Ram (like 50 to a box for the same or less than the 20 packs from Autozone) I'll see if I can find the link tomorrow. They've got sensor pigtails for all makes and all that kinda junk.
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