About to purchase an A code 65 fastback that has a vintage ford tri power set up on it tat evidently came off a 66 shelby ( manifold and carbs)
What is this system worth? It was completely rebuilt by Pony Carburetor in New York I was told.
Chances are I will leave it on because the guy says it runs great on the car, but I also know there are probably some Shelby guys dying to have it.
I can only speak of the tri-power from personal experience. Had it on a 64 Falcon Sprint with a hot 289. Wasn't much for gas mileage, but, man, when you stepped on it, that noise - "WAP" - it was just awesome ! Instantaneous throttle response No sucking air, no spooling up to the rpm's; throttle response was right there. To me, it definitely needs a cam to make it work. If you wanted any kind of gas mileage, you could disconnect the linkage on the two end carbs and only run on the center 2 bbl for cruising. Just make sure you don't get racy situations with the ricers while you're cruising, 'cause it won't happen with the carbs disconnected.
1969 Fastback, original 302, .030 over, Performer cam, Dart 58cc iron heads, 1.94/1.60, original C4, lots and lots and lots and lots of chrome and 20 year old custom paint. She's fired again after 2 years. Sounds healthy.
I agree, a properly sized and tuned single 4 brl will usually run just as strong if not stronger than multi-carb set ups. On the other hand, if properly tuned and well matched to the needs of the engine, there's no reason a 3x2 intake wouldn't pull just as hard as a single 4 but the key is proper tuning which is much more difficult with a multi-carb system and is kind of a lost art these days. The factories started using 3x2's and 2x4's before single carbs were available large enough to feed performance versions of the big motors they were using. That said, I still love the look of a dual quad
"It's not having what you want, it's wanting what you've got!" - Sheryl Crow
Just pointing out, that although "off a 66 Shelby" sounds real good in the story, they never built any 66 Shelby's with Tri-power.
But, that manifold was sold in the "Cobra-kit" catalog through Ford dealers
67 GT 350
67 S code GTA coupe
According to an article in Mustang Monthly awhile back a 3x2 SB setup is much rarer than a BB 3x2 setup. I have an orig Ford 3x2 setup on my 390GT. I installed it to make my car stand out @ shows and it sure does. Bought it from a friend which made my decision easy. When I had my orig. engine rebuilt by a shop than does a lot of work on circle track race cars, I was told to be careful not to select a wild cam to go with the 3x2's as it would only draw to much fuel and "wash the oil". We know what can happen after that. So I let him select a cam. As far as power, engine builder told me if that was to be my goal then go with dual quads. 3x2's will give you somewhat better economy but mostly a show piece. Mine drives just fine after setting it up. One note on BB 3x2 setup, has no ported vacuum so you also need to install the correct FE dual point mechanical advance setup. Not sure about the vacuum setup for SB. Also BB setup MUST come from a Galaxie not a T-Bird. I think these are cool, keep it.
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I once installed this set up on my then new 66 Comet GT 390. I couldn't tell any difference in the power, maybe less than with the 600 Holley I was running. I found out that the tri power I had was from a 406 and the 335 hp 390 had different ports in the heads-the ports in the heads did not align perfectly with the intake. They looked great and I tuned them without much trouble. The linkage was progressive, so I cruised on 2v, had 6v at wot.
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