Quote:

---

Would the 6 pac out perform the 2 four's?

---

Quote:

---

In the article mentioned above, Tom Hoover indicated that he thought it would have been a better performer IIRC. At the very least he seemed to have a real soft spot in his heart for the 3x2 in general vs the 4x2 that they had engineered.

---

it's one of those funny things though, what history does. to me, a hemi has 2X4's, period. that is my taste though, and i still appreciate what others do.

i know that unless i get it tuned to a T, i'm probably leaving a little HP on the table by having 2X4's instead of 1X4, (i know some disagree, but many do agree). but i don't care: hemi's have 2X4's

and here one of the creators of the hemi is saying that if could do it again, he wouldn't do 2X4's

but really, does any engine out there look more like 2X4's belong on it than a hemi???? or is it just me

Quote:

---

I'm wondering the same thing. Is it true that on the street hemi 2x4 dual plane, the 2 front & back longer runners required staggered jetting to avoid a lean conditon in their cylinders? How would that be affected by a single 2 bbl carb over the center runners? If the air/fuel mixture has more time & room to atomize in a dual plane, would larger cfm 2bbls be required? Finally, would the short runner, single plane 2x3 intake run better w/ smaller carbs? Finally, would mechanical linkage be best suited for the hemi w/ the 3x2 setup?

---

Quote:

---

Quote:

---

Would the 6 pac out perform the 2 four's?

---

In the article mentioned above, Tom Hoover indicated that he thought it would have been a better performer IIRC. At the very least he seemed to have a real soft spot in his heart for the 3x2 in general vs the 4x2 that they had engineered.

---

Hoover started experimenting with the Hemi 6 bbl induction in late 69,......Hoover had a lot of engineering programs going on, the 6 bbl induction set ups on the 440's were well recieved by the public, Hoover had already tested several Hemi engines outfitted with 6 Paks, including his own personal 66 Hemi Coronet,..... by early 70, a Corporate decision was made to have the Hemi outfitted with a 6 Pak as standard equipment for the 1971 model year.....however it, along with the entire Hemi engine program was dealt a death blow by May of 1970,.....corporate decided to terminate the RPO Hemi availability with the end of the 71 model line,...so the Hemi 6 pak never saw production, other than 3 manifolds having been made, and 3 cars outfitted with them,......other programs like the "ball/stud" Hemi program, slated for 71 release died too



I had always been aware of the Hemi 6 Pak induction system, among others for quite a few decades,.......When I initiated the 71 Chrysler windtunnel test results and photos to a potential customer in 2001, and in doing so, was contracted to supply prototype wingcar parts for the creation of the 71 Daytona in 2001,.....I also interjected, seeing that the car was to be equipped with a Hemi, that the owner should "go the distance" and equip it with a 6 Pak induction system,....Hence, I supplied the manifold, as well as the engineering, and machine work to transform a factory dual plane/dual quad Hemi intake into a dual plane 6 bbl induction system,....without any welding!.....Carburation is the "stock" 6 pak carbs

Over a period of 3 yrs, we ended up equipping 3 cars with Hemi 6 pak inductions,........IMHO the 6 pak induction is a quicker responding system than the 2X4's, has a better fuel distribution thru out the engine, delivers better fuel economy, up to 16 MPG on a 472 crate Hemi, with 4:10's,....granted the car was also equiped with a .68 Keisler OD 5 spd,.....although we never had a "shootout" with a 2X4 equipped Hemi, ....Topend dominance might have gone to the 2X4 set up, ...but the 6 bbl inductions that I created were very responsive, and reliable, and performance, I felt was on par, if not better on the street with the 6 pak induction,....all the inductions created were vacummm operated, no mechanicals, but IMHO the 6 bbls were a lot more responsive to "tuning" than a 2X4, and once dialed in, stayed dailed in


The "reintroduction", or awareness that the creation of the 71 Dayclona Daytona made in 2002, along with the 6 bbl induction, lead to conversations with Hoover, as well as others involved with such programs, "back in the day",......at one time back around 2004 there was some talk with Dave Hakim, and Keith Black Engineering to "release" this manifold for production, because at the time, only the single 4 was Chrysler only release, and others were looking at retooling the original dual quad,.......it was a long time coming, but I'm glad to see what I thought for sure, given the current economy, the 6 bbl Hemi manifold that Dave Hakim said a few years back, would see production, finally did!........good cause I didn't enjoy machining them!


Mike