Ok, here's my deal. I want to put a 383 stroker in my car, using a '75 Monte Carlo 350 to start with. And I am just thinking of ideas. Has anyone used a dual carb manifold in our cars? What exactly does the cual carb setup do? And also, which is a good, inexpensive reliably carb that can be tuned for econome, or performance. Sorry for all the questions. If this is in the wrong board, I'm sorry. Thanks in advance.

 

This board is fine.

The first dumb question is: Emissions?

We'll have to assume "no" in order to go any further.

Since you're starting with TBI, I'd say your best bet is a single Holley 750. DP if your torque converter is loose enough, VS if you want a tighter converter and no WOT bog ever.

The dual-quad was a way to increase flow in the days before carbs started growing. These days they're more for show than go. Hot Rod ran a series of dyno tests about a year ago comparing different carb setups, and single 4bbl won out over dual quad, 3-2bbls, and even a Weber setup that basically had one barrel per cylinder (although they weren't able to get that setup tuned the way it should have been).

 

Not only that but, but, tunnel rams are very hard to fine tune. Supposedly Holley makes the best off the shelf tunnel ram intake for bolt on applications, but for better efficency, power and money wise an open plenum and 1 big carb will be far better. Unless you have loads of money and time to have the engine on a dyno and start massive tweaking wiuth the tunnel ram set-up.

 

Hey thanks, so my better bet would be a single 4-bbl Holley? So, which intake manifold is better for that application? Also, I plan on swapping out my existing Lo3 and 700R4, for the 383 with a T56 6-speed. Hopefully! Would that change anything? Thanks in advance.

 

If your going 383 then a big carb will be necessary regarless if VS or DP I'd say at least start with a carb that will flow 800cfm minimum, probably get away with a 950 or even 1000 depending on engine specs. That is what ultimatley will decide what you need. But the tunnel ram is not the route to go, I can attest to this personally cause my bro-in-law bought the tunnel ram intake, 2 750DP Holleys and all the linkage and knick knacks to make it work. Sounded good in the shop but ran like a dog at the track, think his best was 11.03. One of the engine guru's came over and started talking high tech mumbo jumbo and all we got out of it was open plenum, 2 inch spacer, 1000cfm carb. So, he switched it all over and went back to the track-4 weeks later of course. He COULD NOT get traction on the line, when he would hit secong the rear would go sideways a little bit so we never got a "best" time cause he could never hook up anywhere on the track, but fastest that day was like a 11.3-no traction though. Now the tracks closed, he ordered bigger slicks, mini-tubbed it and getting ready for next season. It's kinda neat cause his tach cannot keep up with the motor, when he revs it, it'll take a split second that you can see before the tach starts climbing, just an unbelivable difference.

 

There are options besides tunnel rams for dual quad. The conclusion is still the same, though - single 4bbl.

750 CFM is quite adequate until you get into the "wild" category. If you're driving this on the street on a regular basis, then 750 is fine. What manifold to get will depend upon your choice of cam, but again, if street driven, you don't want to get too wild. So, a dual-plane like Weiand Stealth is probably a good choice.

Since you're planning on a T-56, a double pumper is the way to go.