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Yeah, magical thinking strikes again! The 2-barrel carb ratings are at 3" Hg depression, the 4-barrel at 1.5" Hg. So to convert flow from 2-barrel terms to 4-barrel terms you have to divide by the square root of 2. The ACTUAL combined CFM of the three 6-pack carbs, RATED AS A 4-BARREL, is 955 cfm.

Now on to the article that Dpelletier referenced. The engine was a 383. You don't have to be a Mopar nut to know that 383 and 440 intakes are different. But given that the article was about 383 intakes, the results are somewhat favorable for the 6-pack. In average over 2500 - 6000 rpm it made the highest torque by 1 lb-ft over the Torker 383 and tied the Torker 383 in average horsepower.

In peak horsepower the 6-pack was beaten by the TM6, Performer RPM, Victor 383, Torker 383, Weiand High Ram single 4-barrel, Street Dominator and the M1 Single Plane. So it seems that there is truth in the contention that a good single 4-barrel will make more power on a good manifold.

There are flow problems inherent to the 6-pack design that limit its power potential on larger or higher revving engines.
Here's a quote from the referenced article: "We've seen this intake lose a lot of power compared to modern four-barrel intakes on bigger engines or ones with more rpm, but it seemed we just hit a really happy spot with our little 395ci big-block under 6,000 rpm."

R.

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Well, anything can be "spinned", but;

- NOW you have the math right!

- Yes, it's a 383, but the design is substantially the same and it IS a 450hp setup that compares directly to the flow requirements for 440's in the same HP range.

- If you look at the hp and torque together, the little bit of HP that the 6 pack gives up to the 4bbl manifolds you mentioned is more than made up for by increased torque in almost all cases.....so to say that "a good single 4bbl on a good intake will make more power" is NOT a true statement IMO. I could easily say that the 6 pack manifold and carbs makes more peak hp and torque than all but the top 1 or two 4bbl setups which are equal at best.

The bottom line is that to say a 4bbl makes more power "9 times out of 10" is an oversimplification at the very least and plain wrong at the worst.

The only disadvantage to a 6 pack on a 450ish HP B or RB is cost and for those of us that prefer our cars to be stock (or at least stock appearing) those other setups are a non-starter.

Dave

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I would like to do a 6 pack and 4 speed conversion on my wagon sometime down the road.

Would a 6 pack setup fit under a stock 69 RR hood? I have the repro A12 hood also if it won't. Just wondering.

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I would like to do a 6 pack and 4 speed conversion on my wagon sometime down the road.

Would a 6 pack setup fit under a stock 69 RR hood? I have the repro A12 hood also if it won't. Just wondering.

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i would highly doubt it especially if it's on a 440 with a stockish air cleaner.

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The bottom line is that to say a 4bbl makes more power "9 times out of 10" is an oversimplification at the very least and plain wrong at the worst.

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I think the statement should be something more like "9 times out of 10 on a street or street/strip big block, a good 4bbl intake with a decent carb will make comparable power to a 6-pack." Of course the 6-pack will do it with a much higher bling factor and a much higher cost.

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I would like to do a 6 pack and 4 speed conversion on my wagon sometime down the road.

Would a 6 pack setup fit under a stock 69 RR hood? I have the repro A12 hood also if it won't. Just wondering.

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i would highly doubt it especially if it's on a 440 with a stockish air cleaner.

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I would like to do a 6 pack and 4 speed conversion on my wagon sometime down the road.

Would a 6 pack setup fit under a stock 69 RR hood? I have the repro A12 hood also if it won't. Just wondering.

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i would highly doubt it especially if it's on a 440 with a stockish air cleaner.

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why? it sits no higher than a hemi and t hey fit under a flat hood. My 6-pack fit fine under my flat charger hood...untill I added Stage VI heads w/ spacers and carb plates for the meth injection.

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Would a 6 pack setup fit under a stock 69 RR hood? I have the repro A12 hood also if it won't. Just wondering.

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I don't think there is any question about the "WOW!" factor, but a good single 4-barrel on a decent intake will put a 6-pack on the trailer 9 times out of 10. The 6-pack intake has some flow problems that are almost impossible to deal with.

R.

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Proof is always in the "pudding" .....at an A12 shootout bring your 68-70 comparable 4 BBl equipped B body and see who gets spanked

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I don't think there is any question about the "WOW!" factor, but a good single 4-barrel on a decent intake will put a 6-pack on the trailer 9 times out of 10. The 6-pack intake has some flow problems that are almost impossible to deal with.

R.

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Proof is always in the "pudding" .....at an A12 shootout bring your 68-70 comparable 4 BBl equipped B body and see who gets spanked

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bring it. I'll be at MIR on the 29th.

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I would like to do a 6 pack and 4 speed conversion on my wagon sometime down the road.

Would a 6 pack setup fit under a stock 69 RR hood? I have the repro A12 hood also if it won't. Just wondering.

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i would highly doubt it especially if it's on a 440 with a stockish air cleaner.

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why? it sits no higher than a hemi and t hey fit under a flat hood. My 6-pack fit fine under my flat charger hood...untill I added Stage VI heads w/ spacers and carb plates for the meth injection.

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i honestly don't know if it would fit........

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And as for WOW factor. sorry, but this would be hard to beat.
BUT,,,,, this is a LOOOOOONG way from stock

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Proof is always in the "pudding" .....at an A12 shootout bring your 68-70 comparable 4 BBl equipped B body and see who gets spanked

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