Quote:yes seen that shoot out before the 6 pack does very well i think with slightly lean carbs
It's a good intake as-is, but a Six Pack is difficult to tune and set-up for optimum performance. Personally I would be afraid to do anything more than smoothing out any imperfections without a flow bench. I do tend to be rather cautious. You can make more HP with a properly tuned carb on a good 4 bbl intake.
Here is an old but interesting article on dynoed small block intakes.
Yes I have seen that before, the 6 pack doesn't do bad at all in the shoot out
Mopar Muscle Magazine small block intake article.
P.S.: Always look at the "area under the curve", not necessarily peak numbers, for best performance. (It would be easier to understand with a line graph as opposed to a numbers chart.)
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Mine is absolutely stock as it came out of the box on my warmed up 340. It will pull further in the RPM range higher than I am willing to rev it. Ive seen mine well above 5000 a few times tho. IMO your vale train may limit your RPM range more than the capabilities of a 6 pac...
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Mine is absolutely stock as it came out of the box on my warmed up 340. It will pull further in the RPM range higher than I am willing to rev it. Ive seen mine well above 5000 a few times tho. IMO your vale train may limit your RPM range more than the capabilities of a 6 pac...
I hit the shifter at 6400 w/o any issues, stock carbs and intake.
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Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
Quote:there rated at 1355cfm, i know when compared to 4bbl rating i think they are in the 975 cfm range same as the stock vacuum carbs. The manifold ports are quite a bit smaller than the gasket so at the very least i will gasket match them to the heads.Quote:
Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
I think the stock carbs out-flow the mechanicals. FWIW I'm pretty much under 11.50 (unless I blow the tires up) and haven't been asked to leave yet. They key is to put 12.0 @ 115 on your tech card. Usually the guy handing out slips isn't looking inside the car for a cage.
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Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
Quote:well so be it!! It's a street car, like any street driven car it will spend 90% of the time under 4k, it will only see the track a few times a year so I'll live with it, and the better mileage. But if I want to pick up a few more tenths I'll toss my ported strip dominator on it, or my worked torker II, or the venerable LD340 I have laying around here somewhere LOLQuote:
Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
The 6 Pack will be an easy way to slow you down.
Quote:Quote:well so be it!! It's a street car, like any street driven car it will spend 90% of the time under 4k, it will only see the track a few times a year so I'll live with it, and the better mileage. But if I want to pick up a few more tenths I'll toss my ported strip dominator on it, or my worked torker II, or the venerable LD340 I have laying around here somewhere LOLQuote:
Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
The 6 Pack will be an easy way to slow you down.
Quote:Nice! Is that the old Eddy intake or the Mopar? I thought I read somewhere that the intake hit a flat spot around 6,200 rpm but then made power again past that if pushed higher.
I shift my AAR at 7000 and it has hit the rev limiter quite a few times set at 7500. My 340 six pack loves to rev. Best time 12.3 @ 109. It slows down if I shift it anywhere lower than 6600 rpms. It has also gone 11.90 with a small shot of nitrous through the 6 pack intake.
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Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
The 6 Pack will be an easy way to slow you down.
Never say that.....I just ran 10.80's last weekend.
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Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
The 6 Pack will be an easy way to slow you down.
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Im sure even with the stock 6 pack and carbs on top of a good 416" i will have no trouble seeing 11.50's and maybe quicker before they toss me out of the strip for no bar.
The 6 Pack will be an easy way to slow you down.
Everyone says that I'd run 10.60's with a good single plane and 4 bbl....not that I don't believe them, but why change when I'm having a blast making mine run quicker and quicker.
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The big block intake is a different deal than the SB one...
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I think the stock carbs out-flow the mechanicals. FWIW I'm pretty much under 11.50 (unless I blow the tires up) and haven't been asked to leave yet. They key is to put 12.0 @ 115 on your tech card. Usually the guy handing out slips isn't looking inside the car for a cage.
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there rated at 1355cfm, i know when compared to 4bbl rating i think they are in the 975 cfm range same as the stock vacuum carbs. The manifold ports are quite a bit smaller than the gasket so at the very least i will gasket match them to the heads.
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The big block intake is a different deal than the SB one...
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As far as cfm goes there is much speculation about actual flow capability vs a large 4bbl. The old Mopar race manuals said that the outers flow 425 cfm and the center flows 295cfm. Not coincidently the outers have the same venturis and throttle bores as an 850 cfm double pumper and the center has the same as the primaries of a 590 cfm holley 4 barrel. So basically the six pack is an 850 cut in half with the front of a 590 put in the middle. 850+295=1145cfm
Quote:Quote:Nice! Is that the old Eddy intake or the Mopar? I thought I read somewhere that the intake hit a flat spot around 6,200 rpm but then made power again past that if pushed higher.
I shift my AAR at 7000 and it has hit the rev limiter quite a few times set at 7500. My 340 six pack loves to rev. Best time 12.3 @ 109. It slows down if I shift it anywhere lower than 6600 rpms. It has also gone 11.90 with a small shot of nitrous through the 6 pack intake.
Quote:I looked at my outboard and it has down leg boosters the center carb has down leg but with the tube protruding into the center, the shafts are half, not sure if "slabbed" but there not the round type that the throttle plate sits between, the throttle is metal and only .038 thick. Looks like an old 800 and 850 dp I had .
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As far as cfm goes there is much speculation about actual flow capability vs a large 4bbl. The old Mopar race manuals said that the outers flow 425 cfm and the center flows 295cfm. Not coincidently the outers have the same venturis and throttle bores as an 850 cfm double pumper and the center has the same as the primaries of a 590 cfm holley 4 barrel. So basically the six pack is an 850 cut in half with the front of a 590 put in the middle. 850+295=1145cfm
You've missed some key aspects: 1) The boosters in the outboard carbs are different than an 850 (i.e. take up more space), 2) the throttle shafts are not slabbed like an 850 (again, taking up more cross sectional area in the throttle bore, and 3) the throttle plates are aluminum and considerably thicker than in an 850. There are notable differences between an 850 and the outboard carbs.
If the six pack carbs flow 1350 cfm @ 3.0" Hg, and the 850 @ 1.5" Hg, as stated by Holley, then the science and associated math is simple. The six pack will flow 955 cfm @ 1.5" Hg. The question in my mind is if Holley"s numbers are real.
Quote:Quote:I looked at my outboard and it has down leg boosters the center carb has down leg but with the tube protruding into the center, the shafts are half, not sure if "slabbed" but there not the round type that the throttle plate sits between, the throttle is metal and only .038 thick. Looks like an old 800 and 850 dp I had .
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As far as cfm goes there is much speculation about actual flow capability vs a large 4bbl. The old Mopar race manuals said that the outers flow 425 cfm and the center flows 295cfm. Not coincidently the outers have the same venturis and throttle bores as an 850 cfm double pumper and the center has the same as the primaries of a 590 cfm holley 4 barrel. So basically the six pack is an 850 cut in half with the front of a 590 put in the middle. 850+295=1145cfm
You've missed some key aspects: 1) The boosters in the outboard carbs are different than an 850 (i.e. take up more space), 2) the throttle shafts are not slabbed like an 850 (again, taking up more cross sectional area in the throttle bore, and 3) the throttle plates are aluminum and considerably thicker than in an 850. There are notable differences between an 850 and the outboard carbs.
If the six pack carbs flow 1350 cfm @ 3.0" Hg, and the 850 @ 1.5" Hg, as stated by Holley, then the science and associated math is simple. The six pack will flow 955 cfm @ 1.5" Hg. The question in my mind is if Holley"s numbers are real.
Quote:thanks nice info! I know some of the ford stuff I have dug up seems to point to these flowing around a true 1150cfm. I plan on running without the choke plate and rod so add another 40cfm or so to that... LOL. Plan on working the intake, and rebuilding the carbs in the next few weeks hope to have it on and running by October .
Exact same slabbed throttle shaft as 4781. The stamped numbers on the throttle plates are even the same.
I still believe that two 4783s equals one 4781. And then there's the matter of 300 more cfm stuffed in between them.
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Are rebuild kits still avaliable for the aftermarket carbs?