Been doin a LOT of research lately on the 425s.....just for my own enjoyment. I've read the debates on 4x1 vs. 4x2..... but how does everyone feel about the 3x2 and 6x1 applications?
OOOOK... when the factories used 3x2's they went with vacume linkage to simplify things... if you use mechanical linkage , you have to adjust it and then keep it in adjustment.... plus you have 3 carbs to rebuild instead of one, and 3 air cleaners , most of the time... and so on.... that said,,, a large single 4 will, a lot of times, flow as much as 3 x2's.... on a good intake....I really like a big, single carb, with its simplicity, and my doc dual plane mod on the stock intake... that flows real well....:Smarty: as does the 1966 qjet intake,,, but I like the holley carbs better than the qjet... because I have been to school on the holleys.... the qjet guys like them just as much as I like the holleys...:laugh: The more carbs that you have , the more complex maintaining them becomes... 6 or 8 twos can be a real bear to rebuild, syncronize, ect....plus air cleaners is hard to fab for them... and if you dont run air cleaners , you let a ton of dirt, bugs , ect into the engine.... In the real world, I have seen very, very, very few,,, 4x2, 6x2,or 8x2 set ups that ran good on the strip and none on the street... but the ''wow'' factor is out of sight...:Brow: :laugh: REMEMBER,,,, the hassle factor quadruples with the square of the number of carbs on a given engine...:Brow: :laugh: :laugh: But out of all those,,, in multiple carbs the 3x2 set up is the most practical after the single carb.... and ,,,, you would be surprised at how many of those are running around that are just working on the center carb only..... :Brow:
56BB is correct; they do look nice. But you'll notice that they're either a 3x2 set up or a 6x2 set up; no 6x1 set ups. Most of the pictures show six Holley 97's, they're fairly small. A better choice for cfm would be the Rochester 2G series. Six 97's won't give that many more cfm's than a single Q-jet will. Are you after the "wow" factor, or are wanting a screamer?
I'm not entirely certain I will even build a nailhead.......yet. if in fact I was to use one in the project I have in mind, I'm not sure I'd be out for crazy strip times. I really feel that going fast would be nice.....but that engine will do that for me regardless. I guess that overall, economy would top my list. Ultimately a Back To The Bricks trip would be happening......so the better my fuel economy is for 1300 miles....the happier I would be! Although.....wow factor is always nice!
Dont let anyone tell you, You cant make a multi carb motor run on the street. First start reading everything you can find about tuning mulit carbs there is some very good treads on the HAMB about it. One is a 6x2 setup on a Nailhead that would give you a good base line on where to start. I have helped tune a 4x2 sbc and after about 4 hours we had it running just as good as the 4 barrel we took off. I also had a 3x2 on a 364 that was in my Modal A with progessive linkage. It ran very good and with the linkage it just ran off the cener carb till I put my foot in it then it would kick in the other carbs
Most people who run 6x2 end up running Stromberg 97's or Holley 94's Both carbs are around 150cfm's each
We have two cars with 2 4s and one with 3 2s. After the initiial set up all run strong as thunder. However in my experience the main reason for these carb set ups today is under the hood viewing by others and the resulting conversation. I would say that the carb and intake set ups attract more interest than the car design and the cubic inches of the engine. If I had a good option to run 6 2s or I probably would. But there is another good option for some cars. The modern Hillborn set up gives you the old school look with modern fuel injection advantages. (You no longer need ether spray just to get it started) http://www.youtube.com/watch?v=8fYUgKgLy6s
I was referring to actually driving the car, not a photo op - exactly which street car were those zoomies built for?. A substantial number of stack injection sets are "used on the street" by jamming pot scrubbers, panty hose, wire screen etc. into the stacks. If I need to explain this, you should be playing with something else. What was your first name again?
As has been said before, aggravation is proportional to the number of parts in the assembly. For looks, I love dual quads; for driving - a single four barrel. Having said that however, the factory dual AFBs on my '62 Chrysler 300H ran very well and were trouble free. With unsilenced air cleaners, they sounded great too!
I ran with this set whole summer. Now after first season i can tell, no problem,works very smoothly from idle to high rpms. And you really can feel it when you put the pedal.There is no delay at all. I dont say that this is easiest and cheapest way to go with tune ups in dyno etc. but it gave worth of money for me. http://www.v8buick.com/showthread.php?t=231625 Next challenge in spring is try to get work 4x2 Weber IDAs with Kring manifolds.I will put them on to 425.
duplicate a factory set-up..like 2x4 or 3x2... If i didnt want a 2x4 id do a 3x2, id buy a new eelco intake and buy a set of 66 tripower carbs off a 66 GTO/Pontiac....there many high 12 second tripower 4 speed GTOs on the street..and they work, really well, if you get factory carbs, theres no Idle circuts on the 2 end carbs....so nothing to set but the primary...they work..really well,,,so well they made songs of them in the 60s.. plus the sound of the secondaries opening is incredible...2x4s..loud and awesome..3x2 louder and more awesomer..lol Ive owned 2 tripower cars and i drove one 15,000 miles a year to work and back dailey...i was a kid..broke and couldnt afford 2 cars .... ahhh...memories...in the snow too.....with 4.30 gears...weeeeee....$.80 a gallon..yeehaw...damn..i gotta a chubbie... lil gto circa 1964 Little GTO, you're really lookin' fine Three deuces and a four-speed and a 389 Listen to her tachin' up now, listen to her why-ee-eye-ine C'mon and turn it on, wind it up, blow it out GTO You oughta see her on a road course or a quarter mile This little modified Pon-Pon has got plenty of style She beats the gassers and the rail jobs, really drives 'em why-ee-eye-ild C'mon and turn it on, wind it up, blow it out GTO all this fuel injection crap is just that...crap..why drive a 60s car...just buy a new camaro....
We are so far from new Camaro,if we talking about hoodless hot rod with hilborn injection. No matter is it with or without efi. First, looks much more better than 2x4 and the second one is feeling under your feet when 8 throttles opening.
In the sixties I drove a 65 Skylark GS, stock 401, three Strombergs and a four speed. The sound was great when I floored it and the three two's opened up, sounded like it would suck the hood in. No room for air cleaners which was bad. Only problem I had was I had either part throttle or all out full throttle. It would surprise stock 396 Chevelles and usually take them by a couple of car lengths in the quarter mile. I like Marxjunk's idea and have thought about doing that to my next project. That manifold should leave room for air cleaners, which would be a plus. During the same time period a friend of mine was driving a 1966 442 with three two's, that thing was seriously fast. I couldn't even come close to him in the quarter mile. So, in my opinion, multi carb units can perform and with the proper setup they should run fine for daily driving. And they look seriously cool!
We own the 66 442 with three deuces shown above. In 66 such an Olds was the C stock national champion bettering the three deuce GTOs which greatly outnumbered Olds. The car that won that year, has been discovered stored in a barn and is now under restoration. When opened up these cars do have a dinstinctive sound perhaps in part because of the special chambered exhaust pipes installed by the factory.
