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Dual feed 850 Holley vs Six Pack on a 440
#1072968
09/11/11 02:37 AM
09/11/11 02:37 AM
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Joined: Jan 2009
Posts: 903 Oregon
rtplumcrazy1
OP
super stock
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OP
super stock
Joined: Jan 2009
Posts: 903
Oregon
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How does an 850 dual feed double pumper compare performance wise to a factory six pack set up. Consider that the 850 would have a good aluminum aftermarket intake. The 850's i have had in the past were trouble free and worked great when new. I have also had 2 diff six pack set ups-one worked/ran great, the other one ran so so. Do the 440 six pack carbs flow more air/fuel than the 340 carbs.
Put a big block 4 speed Scat Pack Dodge in your garage.
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Re: Dual feed 850 Holley vs Six Pack on a 440
[Re: rtplumcrazy1]
#1072969
09/11/11 04:23 AM
09/11/11 04:23 AM
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Joined: Aug 2003
Posts: 12,291 Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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I believe the 6 pac will get better mileage when normally driven.. the 6 pac carbs are the same only jetted richer for the 440. my 340-6 has gotten me better mileage than my 750s that I have ran on it..
I am truckless..
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Re: Dual feed 850 Holley vs Six Pack on a 440
[Re: BIG-MIKE-500 ci]
#1072971
09/11/11 10:31 AM
09/11/11 10:31 AM
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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:
One thing most don't realise is 2-barrells & 4-barrells are flowed on a different formula. The six-pac is the equal in flow to 960 cfm 4-barrell. The main drawback with the six-pac is the manifold. It is quite restrictive so unless you get something like a Hughes Engines Ported one, I'd go with the 4-barrell.
I dunno my STOCK 6-pack intake and carbs pull really well (shift at 6400-6500) My current best is 11.39 at over 118, car drives great and I ang'd about 11-12 mpg to and from the track. Mostly back roads 45-50mph nice and steady. I like it, keeps pulling and pulling. Nothing wrong w/ a DP thou. I don't think you will lose anything either way. Unless you have amonster motor in which case you'd probably want a BIG carb and single 4.
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