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Maxium Power Through 6-Pack Induction w/500 inches
#1731223
01/16/15 09:30 AM
01/16/15 09:30 AM
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Joined: Mar 2009
Posts: 187
Ia
4spdana
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OP
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Joined: Mar 2009
Posts: 187
Ia
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friend wants to build a 500" 440, using aluminum heads w/ mild porting,2" headers,3" exhaust, 250@.050/.600 camshaft,and top it with a 6-pack. some claim that the manifold will be the bottle neck in this build. what do you think? didn't Mopar Muscle do a engine challenge with a combination like this? if so i can't find it
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: 4spdana]
#1731224
01/16/15 10:29 AM
01/16/15 10:29 AM
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Anonymous
Unregistered
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Anonymous
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It will be like a governor on it. Also when you are just riding around remember you will be driving that 500 CI on those TWO tiny throttle bores in that center carb--not good imo I did a back to back on a 600 HP unit like you mention--with a single four it was like a different animal--I am no six pack fan when it comes to the big cube units Not to mention the long period of time and $$$ it will take to get it running suitable--there will be folks that stand up and say that they can/have made six packs run perfect but......most folks wind up pulling their hair out on those deals. 
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: 4spdana]
#1731230
01/16/15 05:37 PM
01/16/15 05:37 PM
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Joined: Aug 2003
Posts: 43,218
Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
Posts: 43,218
Bend,OR USA
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Quote:
friend wants to build a 500" 440, using aluminum heads w/ mild porting,2" headers,3" exhaust, [Email]250@.050/.600[/Email] camshaft,and top it with a 6-pack.
some claim that the manifold will be the bottle neck in this build.
what do you think?
didn't Mopar Muscle do a engine challenge with a combination like this?
if so i can't find it
Don't beleive what you hear, especially from those that do not own or ever used a sixpak  My 518 C.I. pump gas low deck stroker made a lot of power from day one with a set of mildly ported 906 iron heads, 612 HP @ 5500 RPM and 644 Ft. lbs @ 4500 with 511 C.I. I swapped the heads(CNC ported Eddy RPM  ) and then swapped the crank the next year to bring the dished piston up to zero deck. The last time that motor was on the dyno with the Eddy dual plane low deck sixpak intake and stock type OEM 440 six pak carbs jetted fatter it made 720 HP and 710 Ft lbs. on 10% Ethanol Oregon pump swill   Are there better intakes and carbs, yes there are Will his sixpak make good power, YOU BET it will My 3450 lb (with me in it) Duster ran a best of 10.15 at 132 MPH with the six pak, it ran 9.993 at 134.6 MPH with a set of Indy SR M.W. ports and a 1050 Holley Dominator on a Indy 400-3 intake on non ethanol Oregon pump swill with the exhaust and air cleaners on The sixpak carbs need tuning to get them perfect, have him jet the outboard carbs up to around .089 on the fuel inlet holes and leave the center carb. stock on the jetting, he will need to work on the vacume pod springs to get the carbs to open the way he likes them  Have him adjust the idle mixture screws on the outboard carbs all the way in (gently) until the bottom out and then open them no more than 1/2 turn out and then start the motor up and adjust the center carb. idle mixture screws and idle speed screw to get it where he likes BB Mopars like air, the more the better  Let us know what you guys do and how it runs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: lewtot184]
#1731232
01/16/15 06:11 PM
01/16/15 06:11 PM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
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Doesn't the 6 pack setup ultimately flow around 1350cfm? hard to imagine the carbs being the limiting factor on horsepower, especially when you consider how fast people are going on a single dominator.
Tunnel ram intake with removable top and and a 6 bbl adapter would be neat. anyone ever done anything like that?
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: VincentVega]
#1731233
01/16/15 06:52 PM
01/16/15 06:52 PM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
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Joined: Jan 2003
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U.S.S.A.
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Quote:
Doesn't the 6 pack setup ultimately flow around 1350cfm? hard to imagine the carbs being the limiting factor on horsepower, especially when you consider how fast people are going on a single dominator.
Tunnel ram intake with removable top and and a 6 bbl adapter would be neat. anyone ever done anything like that?
No it really only flows about 950cfm
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: JohnRR]
#1731236
01/16/15 07:04 PM
01/16/15 07:04 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
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Doesn't the 6 pack setup ultimately flow around 1350cfm? hard to imagine the carbs being the limiting factor on horsepower, especially when you consider how fast people are going on a single dominator.
Tunnel ram intake with removable top and and a 6 bbl adapter would be neat. anyone ever done anything like that?
No it really only flows about 950cfm
I will not dispute you, however I have seen the 1350 figure from multiple sources, including Hot Rod
http://www.hotrod.com/how-to/engine/mopp-0801-mopar-six-pack-tuning/
Where did you find 950?
Now I see 1030? the outboards are considered a 500 cfm carbs but they're really not.
https://board.moparts.org/ubbthreads/showflat.php?Number=7515387
John just wishes he had one..
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: Mr.Yuck]
#1731237
01/16/15 07:06 PM
01/16/15 07:06 PM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
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Northeast
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I had always figured 2 x 500 + 350. although, that is a pretty healthy figure for the end carbs. I have one of those aluminum high rise 6 bbl intakes for small block, along with a set of reproduction Holley carbs for it. was a christmas present probably 15 years ago, maybe longer. never used it on anything yet! in fact, here is my intake  I love that manifold. Would love to EFI it with 3 throttle bodies
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: Mr.Yuck]
#1731239
01/16/15 08:50 PM
01/16/15 08:50 PM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
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I Win
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Quote:
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Doesn't the 6 pack setup ultimately flow around 1350cfm? hard to imagine the carbs being the limiting factor on horsepower, especially when you consider how fast people are going on a single dominator.
Tunnel ram intake with removable top and and a 6 bbl adapter would be neat. anyone ever done anything like that?
No it really only flows about 950cfm
I will not dispute you, however I have seen the 1350 figure from multiple sources, including Hot Rod
http://www.hotrod.com/how-to/engine/mopp-0801-mopar-six-pack-tuning/
Where did you find 950?
Now I see 1030? the outboards are considered a 500 cfm carbs but they're really not.
https://board.moparts.org/ubbthreads/showflat.php?Number=7515387
John just wishes he had one..
I did at one point , my first 69 RR had a 440-6pk ...
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: dogdays]
#1731240
01/16/15 08:52 PM
01/16/15 08:52 PM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
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Quote:
So we go through this again: Twice in the same thread!
Two barrel carbs are rated at a 3 inch pressure drop across the carb. Four barrel carbs are rated at 1.5 inches of pressure drop. To convert from a two barrel rating to a four barrel rating you DIVIDE BY THE SQUARE ROOT OF TWO!!!
That's 1.414... for those who don't have a calculator with a square root key.
1350 / SQRT2 = 955cfm.
1150 / SQRT2 = 813cfm.
etc.
R.
The thread is not done yet , we will probably go thru it a few more times.
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Re: Maxium Power Through 6-Pack Induction w/500 inches
[Re: dogdays]
#1731242
01/16/15 09:18 PM
01/16/15 09:18 PM
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Joined: Oct 2012
Posts: 1,106
Northeast
VincentVega
super stock
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super stock
Joined: Oct 2012
Posts: 1,106
Northeast
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Quote:
So we go through this again: Twice in the same thread!
Two barrel carbs are rated at a 3 inch pressure drop across the carb. Four barrel carbs are rated at 1.5 inches of pressure drop. To convert from a two barrel rating to a four barrel rating you DIVIDE BY THE SQUARE ROOT OF TWO!!!
That's 1.414... for those who don't have a calculator with a square root key.
1350 / SQRT2 = 955cfm.
1150 / SQRT2 = 813cfm.
etc.
R.
I never knew this. Is this a holley thing only? But I don't believe it is that simple, as an engine will have a vacuum reading (draw) all over the place.
On a large enough engine, with a big enough draw, who is to say it won't pull 3 inches? or even more? If it does that, then the 1350 capacity is now reality. I would say on a big enough engine, with cam, and high rpm, it should be possible.
So what is the point of the discussion? to talk theory, or application?
Looking for 1975 through 1978 B body 4 door sedan sheet metal or parts cars - monaco, fury, coronet. Please let me know
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