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well i'm perchasing an old 400 smallblock from a friend and i'm going to build this engine and was thinking about putting duel carburator intake manifold on there but don't know if this will be good for mudding or not because i mud alot and want to know if this is a yes or no?

welcome to the site. Well with all that carb, I would think you'll end up doin more spinnin than anything. Maybe I am wrong, but I would think runnin a dual carb set up is more for the street rather than the mud. Just get a nice edelbroch for a 4bbl, and have fun. If you put a sbc400 in your luv { which by the by is what I am runnin } that is plenty of power, and you will need some weight in the rear!

Just be prepared to spend some extra $$, the 400 has some parts specific to it that won't work from another small block. But I guess it depends on what you need to replace.

Welcome to the site.

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Resident lurker

I dont know if all of that extra weight will screw things up for you. You didn't mention if you had a 2 or 4WD truck. I'm assuming it's a 2WD because putting a 400 SB Chevy and trans plus transfer case to match is a big mod and you would have mentioned it. Front end parts WILL wear out faster than normal and fail if you get in too big of a bind.
I used to love taking my truck off-road back when i first got it and it still had the stock setup. But even then, i was hit with the realization that replacement parts cost money.
I too have a SB 400 under the hood and on the street, it's a handful to steer at very, very low speeds(this is common with all SB Chevy setups). I can only think that it will be even more pronounced if you're mudding. It would seem that the front end will need to be upgraded with better than average parts so dont be suprised if this becomes apparent. Good luck with the project and keep us informed with the progress.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

if you want to stay 4wd with a big motor like that, the whole drivetrain has to go. go with a dana 44 or better front axle and a 9" or dana 60 rear as a minimum. big tires and a big motor make lesser stuff go boom

I can vouge for that

almost every thing fromt the 350 works just not the pistins and stuff because that is a 350cubic inch not a 400cubic inch

Well I hate to argue with a Dr. but I have to disagree. The 400 is an externally balanced motor which in turn required a diffrent Vibe dampner, diffrent flywheel, diffrent timing mark thingy. The heads have a couple holes in them for I think they called it like a vapor hole or sumting like that. But ya the starter, waterpump stuff like that will swap no prob. Believe me I went through some sh*t trying to get my motor together becuz of stuff like that!

I went thru this last spring with my 400 build and yes, there's enough stuff specific to the 400 that almost makes it a Chevy motor of it's own. But all of the cool stuff to build up a motor will fit either one (cams, timing chain assy's, distributors/ignition systems, intake manifolds, headers).
But as with all motor builds, everyone tells the parts guy/machine shop specifics of their particular motor even down to the V.I.N. code. Always ask if will work with a 400 just to make sure.

As for the original question of a dual carb intake, personally i dont think it's nessesary in this case. A 400 with an off-road carb will be more that ok to do the job. The bigger issue will be traction with the extra horsepower. With 3 times over stock power, you need to get that to hook up.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

ok sorry for not mentioning this but i don't actually own a chevy luv. i just have a friend that goes to this website and has gotten alot of good advice so i thought i'd ask i actually own a scottsdale 3/4 ton with a 350 under the hood and 35inch tires (which are way to small got to upgrade to 40's) but now that you know i have a bigger truck than a luv do you think it would be a good idea to put duel carb on a 350? thanks for the advice and keep it comin!

Ohhhhhhhh!!! Now I see, well what does it matter now j/k, still dont see why you need so much fuel for muddin. Still sounds to me traction will be an issue. Good Luck

I'd say upgrade the tires and take it out and see.
My own thoughts on doubling up the carb is that it seems unnecessary...

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Resident lurker

I myself would rather go to a fuel injected intake. It will cost more than a dual carb setup but it's more efficient, no carbs to syncronize or act up and it will handle akward angles on the trails without flooding or starving the engine.

_________________
Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

Dual Carbs = Pain in the ass

Seriously, unless you really need the capacity of dual carbs, don't do it. It looks cool, yes, but functionally, especially in a stock-mild 350, its just not there. You can tune and tweak dual carbs all day long and by the end of the day, they still won't be in insync (sp?). A friend of mine had a dual carb setup on his 32' Ford, if he wasn't putting new rear tires on it, he was synchronizing the carbs. Plus he had a hard time making the 350 idle with the two carbs, just too much fuel for the engine to handle when idling. Not to mention throttle response was crappy at anything below 2000 rpm.

Nowadays they make some pretty efficient 4 barrel carbs. From 390 cfm all the way up to and beyond 1000 cfm. So if your engine needs extra carb, don't add another one, just add a bigger one. I find it highly unessecary for a basically stock 350 to make good use out of a dual carb set-up. A nice reliable edelbrock or Q-jet even would suite your purpose just fine. But if your the ambitious type, try the dual carb set-up, it might work out fine, but just from what I have experienced, they are not worth the hassle. Just my two pennies..

unless you are gonna change the cam,,heads,timing too much carb will simply slow you down/bog down,motor has to be able to turn rpms .yes and a decent 4 b carb will work just fine....putting dual carbs on a stock engine will not make it go faster,pull harder,power comes form within,I am talking about carbs, not fuel injected....computer vehicles..a properly jetted and flowed carb for your vehicle will do wonders.....I have a plumbed850/ 930 on my 406 and a 1050 dominator on my 434....you can call holley,any carb place and they will tell you what works best with your set up,but you will need specs form cam,compression etc.....those guys are right on man.....

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434 pushing 732 hp with no spray!!!