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Old 11-25-2002, 09:54 AM
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Question What is a Cobra?

I'm very new to the Mustang world... I just bought a 66 stang with a 289 in it. But it's got "Cobra" all over it. What makes a mustang a Cobra?

Also, it's a 289 with a Tri-power Carbs, 3 speed auto with 462 gears. I planned on getting a Holly 600CFM 4 barrel, change the gears down to 390's and upgrade the tranny to include AOD. What else should I be looking to do, and how could I improve the performance of this car?

Thanks <img src="confused.gif" border="0">
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Old 11-25-2002, 10:40 AM
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I am not a mustang guy so I cant tell you if it is authentic, but I dont think there were mustang cobras in the sexties though. BUT, if there were, and you got one, dont F it up by changing things. If it is authentic, it is worth far more in original condition.

chris
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Old 11-25-2002, 10:44 AM
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Well, I don't even know what Cobra means. I do know this car had a str8 6 in it and he upgraded it to a 289. I have a list of all the stuff the guy did... I think he just may like Cobra labels.
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Old 11-25-2002, 10:57 AM
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I'm not real up on Mustang history, but you might have something special there. And if it is, I'd be lookin more at restoring it than updating it. It would be worth a lot more (depending on things like rust and collision repair etc.).
Also, in my mind, a tri power 'stang seems like it would've come with a four speed tranny instead of an auto. Take a look up under the dash and look for a clutch pedal. I bought a 68 Mustang once, with a c4 auto in it. Got to pokin around in it and found a clutch pedal under the carpet. It wasn't long before I swapped in a Borg Warner T10. But really, if'n it was me, I'd be rebuilding that 289/tripower.
Basically, a Cobra Mustang is a Mustang that Carroll Shelby improved. I don't know much about what happened when but Shelby built the most awesome car ever built IMO. It was an all aluminum bodied car, not much bigger than a Mazda Miata, but it had a 427 ci side oiler motor in it. The power to weight ratio was sorta like shootin a .22 out of a Howitzer.
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Old 11-25-2002, 11:03 AM
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Well, Like I said... he rebuilt it and added the 289 (was a straight 6 / 3 speed auto). And he has Cobra GT all over the thing... I think he was trying to dress it up. I'm just curious what differentiates a regular stang and a cobra.

Also, I have read in numerous places that a nice Holly 600cfm 4 barrel will run better at high RPM's that the 6-pack. Is this not accurate?

My goal is to get the AOD 4 speed, drop the gears a little and have fun... <img src="graemlins/evil.gif" border="0" alt="[evil]" />
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Old 11-25-2002, 11:08 AM
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Rest assured you don't have a cobra. The 1966 mustang wasn't offered with that package.

The cobra mustang means the car is an upgraded engine and suspension package. (Not sure about interior amenities though.)

~Michael
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Old 11-25-2002, 11:15 AM
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So based on this thread... what should I be doing to this 289? Tri-power or 4 barrel? Upgrade to AOD? Drop the 4.62 gears to what? Purpose of the car is nice days, 50/50 highway/city use...

What do you think?
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Old 11-25-2002, 11:26 AM
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Well, since it ain't an original, I'd say swappin on a single four bbl would be more efficient than the tripower. Use a dual plane intake.
The aod might put your final drive ratio into something more streetable (you might still want to change to about 3.70:1 though.
Sounds like a worthwhile project.
Good luck.
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Old 11-25-2002, 11:29 AM
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Well, if a 4 barrel with dual plane intake is more efficient... what about power? I am pretty new to cars in general and while the tri power looks nice, I want what's going to provide the best performance as weel.
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Old 11-25-2002, 11:37 AM
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It is NOT a real cobra. Carrol Shelby took stock mustangs from 1965 to 1970 and added more power to the 289 and 428 in later years. (i think 305hp and 335hp) upgraded the suspension, added appearance items and custom interior, then resold it as a GT-350 with a small block and a GT-500 with a big block, and they were refrenced to as "Cobras" because of the abundance of cobra emblems. Mustang Cobras are not to be confused with AC Cobras. They were both made by carol shelby but the latter of the two was a completely different car. He took the body from an english car company, AC sports cars, and he put fords engines in them(289 and 427), custom tuned the suspension and took it to the races. The rest is history.

Now then since you have a mustang, It is NOT a cobra. Shelby only made Gt-350s with fastback mustangs and a couple REALY rare convertibles and they pretty much all were white with blue stripes. THey also only came with 4 barrel 289s and 4 speeds and 9inch rears. THe exception is the Hertz Shelbys which were painted black with gold racing stripes and were equiped with an automatic. SInce you said that it was originally equipped with a 6 cylinder it is not a cobra. ALso, from your gear ratio i can tell its an 8inch rear, not a 9. He probably just got a 289, added cobra valve covers (which you can buy anywhere) and put a cool induction setup on it.

It sounds to me like a run of the mill clasic mustang. Not to be discoraged, these cars are still bad *****. I have one too see &lt;-- If i were you I would switch to a 4 barrel. Its much easier to tune one carburetor than 3. Also, i would change the gears to somewhere in between 3.50 and 4.11. The AOD is a good idea and i would deffinately get it. With the steepish .67 overdrive gear, those 4.11s won't hurt you sooooo bad. I would get some good headers too to help get some added umph.

Good luck with your mustang!
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Old 11-25-2002, 11:45 AM
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What kind of HP could I get out of a stang like this? The guy I bought it from said he did a ton of work on it and "claims" that he had it measured at 425 HP... I don't exactly believe that, but based on what he did to the car and teh great condition of the body/frame, I coulnd;t pass it up for $2500.

What do you think about the HP potential?
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Old 11-25-2002, 11:51 AM
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When I say more efficient, I mean you'll burn more gas better, hence more power. The tripowers do look cool, and back in their day were a hot ticket, but advances in technology have made four barrel carbs the way to go (short of fuel injection).
I'll guess that a 600 cfm four barrel may outflow all three of those carbs, maybe not. But one thing for sure is you won't have to sync your carbs all the time. If I'm not mistaken, only the middle carb opens during part throttle and the other two progressively open when you mash it (kinda like secondaries on a 4bbl). To get max power from all three carbs, you have to sychronise them so they all flow exactly the same amount. Pain in the arse. You won't have to do that with a single 4bbl.
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Old 11-25-2002, 11:55 AM
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Any ideas on what type of tranny i could use to upgrade to the AOD? What should it run me to upgrade this?
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Old 11-25-2002, 07:31 PM
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if you're running up to 300hp a stock AOD will work and all you need is a custom crossmember, shift linkage and TV cable linkage along with shortenig your driveshaft. If you plan on running up to 450hp you'll need an aftermarket input shaft cuz the wimpy stock one won't do. Anything above that, you will need a solid imput shaft and that'll work with up to 800hp. You will need a custom converter with this too. You can find AODs in 84-92 mustangs, crown victorias, cougars, and town cars behind a V8. I picked up mine from an 88 cougar from Pick n Pull for 35 dollars. Rebuild kit was 260 from Art Carr, shift kit was 80, solid imput shaft was 250, converter was 500. Building your C4 will definatly be cheaper, but it doens't have overdrive. People will argue you should rebuild your C4 and then buy a gear vendors $2000 overdrive unit to put behind it. When it all comes down to it, the AOD will still be cheaper.
<a href="http://www.windsor-fox.com" target="_blank">www.windsor-fox.com</a> handles conversion pieces to put AODs into classic mustangs, and <a href="http://www.artcarr.com" target="_blank">www.artcarr.com</a> handles the aftermarket tranny parts.
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Old 11-25-2002, 08:52 PM
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My dad had a 66 Mustang daily driver in the 60's with a built 289 with dual quads and 4.88 rear.I guess on 9" slicks it was capable of removing both front wheels from the pavement.
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