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They appear stock. Only real way to tell would be to measure them. Not sure of exact dimensions but I am sure someone here has a clue.
 

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I believe those are stock too.
Look on the existing pullies and see if they have a Ford stamp or part number on them to see if they are stock or not.

IMO, UD pullies are not worth the possible charging/cooling problems they can cause and your money would be better spent elsewheres.

But if you insist, I think I have a set somewheres in my shop that I removed a few years ago.
 

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Not to steal the tread but I've heard 95 cobras come stock with under drives, is that true.
Cross between an elephant and a rhino?
Elephino?

What I found: "They are slightly under driven compared to the GT pullies, but not near as much as a set of aftermarket ones."
 

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Did you have problems then? Iv heard they are really worth it.
Charging problems.
Instead of upgrading the alternator (I didn't have the cash at the time.) or swapping the factory pulley back on the alternator and negating some of the benefits, I just put my stock pulleys back on.

Since then I have purchased a 200A alternator for my car, but since I also bought my SC around the same time, so I figured I didn't really need the UD pulleys. Plus I am going to use an electric water pump and fan so that negates some of the UD benefits too.

I really didn't notice much, if any difference in the car with them on it.
Now removing the engine driven fan and water pump, that frees up some power you can really feel.
 

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you can pretty much use any fan you want as long as it fits.you have to be careful about a fan that draws to many amps or may may have charging issues.i got the whole off road accesory drive kit from lrs and i to had charging issues.but i just put a smaller pulley on the alternator.i did like trojan said " negate " the undrive pulleys.i did it though because they looked alot better than the stock ones.when i did that i had to get a shorter belt also.i to will probably put my stock pulleys back on when i do my s/c install.i do recomend though using a relay when hooking up an electric fan.the one i used is adjustable and alows me to dial in my running temp perfectly.http://www.summitracing.com/parts/DER-16759/
 

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Discussion Starter #10
What is a SC?

---------- Post added at 11:12 PM ---------- Previous post was at 11:11 PM ----------

What if I just don't change the pulley on the alt

---------- Post added at 11:13 PM ---------- Previous post was at 11:12 PM ----------

The one that's on there looks real small
 

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The crank pulley will still be smaller.which isn't a big deal but u will still lose a little charging.also the alternator is one of the main accessories that comes with the ud pulleys, so u are getting less than u could.the best way is to get a high output alternator.also if u slow your charging system and add an electric fan you will most likely have charging issues unless u do go with a ho alternator.

S/c = super charger

---------- Post added at 10:21 PM ---------- Previous post was at 10:19 PM ----------

Also ud pulleys = smaller crank pulley + bigger accessory pulleys
 

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Discussion Starter #12
I see, I will still try it because I'm a stubborn teenager and got some for real cheap. But when I put them on and start it up shouldn't I be able to check how many amps the alternator is putter out and see if it's good?
 

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NateNasty said:
I see, I will still try it because I'm a stubborn teenager and got some for real cheap. But when I put them on and start it up shouldn't I be able to check how many amps the alternator is putter out and see if it's good?
Yes you can use a volt/amp meter on the battery.
Btw my main problem was at idle.me personally would never by another set but hey your choice.who knows it may work out good for you.good luck.
 
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