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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
Joined: Jan 2009 Posts: 903 Oregon R rtplumcrazy1 OP super stock
rtplumcrazy1 OP super stock R Joined: Jan 2009 Posts: 903 Oregon	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.

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
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	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..

Re: Dual feed 850 Holley vs Six Pack on a 440 [Re: rtplumcrazy1] #1072970 09/11/11 07:00 AM 09/11/11 07:00 AM
Joined: Sep 2008 Posts: 42 Nelson-New Zealand BIG-MIKE-500 ci member
BIG-MIKE-500 ci member Joined: Sep 2008 Posts: 42 Nelson-New Zealand	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.

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
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	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. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: Dual feed 850 Holley vs Six Pack on a 440 [Re: rtplumcrazy1] #1072972 09/11/11 01:35 PM 09/11/11 01:35 PM
Joined: Jan 2003 Posts: 31,017 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,017 Oregon	There isn't really an answer for that other than the standard "it depends". The six pack setup is a great design that works well in certain applications. But once you get outside of its design capability then it doesn't work so great. Same thing with the 850 DP.

Re: Dual feed 850 Holley vs Six Pack on a 440 [Re: AndyF] #1072973 09/11/11 02:08 PM 09/11/11 02:08 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: There isn't really an answer for that other than the standard "it depends". The six pack setup is a great design that works well in certain applications. But once you get outside of its design capability then it doesn't work so great. Same thing with the 850 DP. I agree both work good within their limitations. From what I have seen the 6pk works as good as an 850 DP in any street/strip application. From what I have read in Andy's very good book I feel the 6pk might make more power then the old crossram setup does. Ron Last edited by 383man; 09/11/11 02:09 PM.

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