thirdgen60

iTrader: (10)

So im going to buy a new carb and i was just wondering what everyones opinion is on what works best with the ls motors. What size, peoples perfered brand and so on.

It will be going on an lq4 with L92 heads, a single plane gm intake, and a 225 duration cam.

I was thinking about getting a mighty demon 750.

supershift67

iTrader: (1)

definitely a Quick Fuel 750 or 850. I have had good luck with mine and I have had 6 different people try the one that I own and every person sold their carb to buy a quick fuel. The one I have is a 850 double pumper but with your cam size I would say a 750 would work good.

thirdgen60

iTrader: (10)

Also would anybody recommend annular over down leg?

Pop N Wood

iTrader: (1)

Which model Quick Fuel carb do you have? SS? Q series? Also what mods have you made to it?

There have been a couple of threads with people stating their carb set up. Most seem to run a 750. Opinions run strong on the Demon carbs. Some people love it others think they have poor quality control.

I have a 750 Holley DP. This carb takes some tinkering to get right with an LS motor with the open plenum intake and stock cam. The out of the box idle circuits are jetted too rich. Getting something with adjustable air bleeds and/or idle restrictors would be a good idea. they also need a pretty good shot from the accelerator pump to get off idle without a bog. All of it can be done, just takes a little trial and error to get dialed in. I think a straight DP would be happier with more cam.

Annular vs. down leg is a little beyond my level of experience right now.

There is a pretty informative thread in the Gen 4 forum on cams for L92 head motors. Definitely worth a read. L92 head motors seem to respond quite differently to cam duration than cathederal port head motors. By the same logic that might influence the carb choice.

RascalsRodsCustoms

iTrader: (2)

I agree on the Quick Fuel,yes on annular, had Demons, they are ok, just do yourself a favor & take the bowls off, and clean it before you start. They work fine after that.I have a friend that actually took a bag of metal shavings, from 5-6 of our Demons to PRI, and gave to Barry Grant, he denied an issue, huh

daschra79

iTrader: (2)

I would recommend a Pro Systems carb. They cost a little more than the others, but you get what you pay for. You tell them all the specs on your engine and they build a carb that will work for your set up.

Ravenous T\A

iTrader: (12)

im running a Holley 750DP, runs a little rich so I bought some jets to fix it but the weather has been bone chilling so Im gonna wait till i can get some dyno time and get it spot on and see what I have gained from dumping the 750 Edelbrock. I have a good size cam and heads that flow a little more then the L92's so I'd recommend a 750DP

S10xGN

iTrader: (11)

If you haven't bought a carb yet, go annular! There's such a big bonus in low speed torque it more than outweighs the loss of a few CFM's up top. I currently have a Holley HP750 and I'm waiting on a new annular main body...

Ravenous T\A

iTrader: (12)

what kind of times are u running with that Mav?

Orangepeeler

iTrader: (13)

I have a Quick Fuel 750 cfm carb for sale. It is new in the box with all paperwork. It is the Q series with annular boosters. These carbs come with the billet baseplate and metering blocks. I would like to get $600 shipped for it. Thanks, Mike.

NemeSS

iTrader: (127)

i like the pro series hp 750s
but a street 750 hp would be adequate for your car. and there tune is very close out of the box.

camarof41_383

iTrader: (7)

I would also recommend pro-systems. I've had 2 of their carbs and they were tuned perfect out of the box. All I had to do was set the idle mixture screws and idle speed. Patrick James knows his stuff and he has always been very easy to reach when I've had questions.

shortyb72

iTrader: (2)

pro-systems all the way

S10xGN

iTrader: (11)

No times yet, but I'd expect 11.50's or so based on 370 RWHP and 3300 lbs...

DMMizell

iTrader: (1)

ProSystems all the way!
no adjustments needed, worked great out of the box, made for my 6.0/l92.
The Idle,response and shift recovery is great, take a listen..
http://www.youtube.com/user/chvl7140.../1/fn719sol8hE

Dave

thirdgen60

iTrader: (10)

what did it cost to have pro-systems build you guys a carb

DMMizell

iTrader: (1)

mine was $590. plus shipping.

holley505

iTrader: (1)

I am running a 750 AED HOLLEY DP flowed to 780 on a 418 ci Ls3

I have a 850 cfm HOLLEY DP for Sale 350.00 firm!

NemeSS

iTrader: (127)

outright? no core? thats a heck of a deal.

Jimbo1367

Sounds SWEEEEEEEEEEEEET