You "read" somewhere, well I worked for Mr. Norm for 15 years and believe what he told me. He also didn't use the Tri-Power air cleaner on the first few cars, went to Western Auto and bought the three tiny chrome air cleaners for those also because they were cheap...

I think I have a misunderstanding here. Correct me if I'm wrong. Mr. Norms carbs did have vacuum secondary's. Now it makes sense and I agree with the Chevy carbs. I assumed that mechanical setup was used on Mr Norm, but it was strictly a DC item made just for DC.

I have been using these carbs since the early 70's.
I was told back then and believe they were originally developed to replace the vacuum operated big block tri power corvette carbs which were introduced in I believe 1967. This I always believed to be true due to the L side fuel inlets.
Somewhere, someone figured out these would also bolt onto the mopar six pack manifolds with the only issues being the L side fuel inlets which many worked around employing different approaches.
Hustle stuff/ Direct connection jumped on the bandwagon and began offering the carbs for both big and small block applications.
IF the carbs had been developed strictly for Mopars I believe the fuel inlets could have easily, and would have been put on the other side.
I also believe that someone at holley looked at the earlier Ford tri power carbs that had been around since 62 or so and said with some minor mod's we can adapt these over to the corvette and the 4782 / 4783 series was born / introduced. Along came the 69-1/2 cars followed by the T/A & AAR's and as mentioned above someone bolted them on a Mopar. So, we sit here almost 60 years later disputing the original intent for the carbs with no one really knowing the actual facts.

Well, I think we are splitting hairs here. The Ford tripower has completely different air horn than the Chevy. It is pointed on the ends. Both Ford and Chevy both have the tall air horns on the outboards. The parts to build these 4782/4783 combo did not even exist until early in 1969 and these outboard main bodies were only used on the outboards on Mopars. They modified the machining process to make them mechanical secondaries. The outboard throttle shafts were made strictly for these 4783 Those other parts are just std Holley parts that they were already making. They wanted metering blocks on the end carbs that were easy to change jets. The short bowls had to be used because the rear carb would not fit with the regular center pivot bowl. The part numbers tell me Holley came up with this idea in the early 70 year. The dates on the carbs verify that. I believe Rhino on the Mr. Norm deal about him using the Chevy carbs. They did not have the idle circuit in the base of the outboards or the hole drilled in the outboard throttle blade. I could see that saving $10 in machine work in the 70’s. Mopar wanted the outboards to meter a little gas in order for fuel to stay fresh and the needle and seat to not stick.

On a side note to the OP. If you are happy with the performance of the carbs, keep them. If you want a nicely restored set of date coded 70 440 4 speed carbs, i just finished at set. A shaker air cleaner is so big, no one can even see the carbs. Even a regular six pack air cleaner is so big, very little of the carbs can be seen. I’ve got nice carbs on my AAR so I take the air cleaner off at shows. People like to see those nice Holleys all lined up.

These carburetors were developed by Holley for Ford to use in NASCAR racing, when the NASCAR guys had to go from big blocks down to small blocks.

https://www.ford6vcarburetion.com/ford-6v-tech/

You can see in the story here, that NASCAR banned them before Ford even got them on the track. Ford scraped their program, which left Holley with a fully developed mechanical Six Pack and no customer.
They offered them to GM and MOPAR. GM said no, MOPAR said yes. The Carburetors were then sold through the Direct Connection program.

Robert

Thanks, I knew I read that somewhere.

hi

the carbs that mopar used were not the ford verson .


the artical even states that ,.

the mopar ones do not have the square pointed corners for the air cleaner to sit on . diffrent gasket .

also mopar ones do not have air horns on the outboards ! different list numbers ! diffrent jetting .

exactly correct, I run these on my demon 340, they flow about 200 cfm more than the stock mopar carbs, the outboards are basically 850dp cut in half, thin throttle blades and slabbed shafts !!