Too much carb for my car?

IMO that 750 is tooooo big for a basically stock 306 with no power adder or anything like that, My buddy is running a 650 with mods like yours and it runs like hell.

Matt

u wont have a problem im runing an 1150 on my 650hp n/a 454 carb as 50cc injectors too, carb is good for 2000hp

do your heads have any port work done?

I would think you might be able to tune it to run ok, might really hurt the bottom end though. ???

saltymaz said:

like, serious serious bottom end losses?

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I don't really know -- it might be able to be tuned out by someone who knows what they're doing -- but it's a pretty big carb for a small engine. I ran a 650 on a 302 with Edelbrock RPM heads and intake with a little work done to them and the bottom end wasn't the greatest, so I would think with a somewhat similar setup, an extra 100 cfm might hurt down low. I'm sure up top you'll really nice -- I suppose it all depends on the tuning.

I would have selected a 650 DP, or a 750 with vac secondaries. You can get by with a oversized carb with vac seconds a lot easier, since if the engine is not pulling enough vac to need them opened, they will not open. You may be able to put a 650 throttle plate on it to band aid it if needed.

Contact Quickfuel at 270-793-0900 and ask for Marvin. He will tell you if this will work. If not, maybe work out a swap. Good luck.

get a carb spacer, and tune it right ull get away with it, might want tog et a fuel preasure regulator and run it a lil lean but thats experimental use it on ur own risk

Who is this camaro guy? Do you know anything about cars or are you on here to try and sabotage as many mustangs as you can with your crappy tech advice?? What the hell are 50cc injectors?? Sure you dont mean 50cc accelerator pumps. And pump size is only to cure the lean condition created by a slow reacting fuel system in the carb as you quickly pump the gas. It has really nothing to do with the overall rich or lean condition in an engine. And a fuel pressure regulator will never lean out your carb. All it will do is stop gas from filling up the bowls correctly, and then you run out of gas when you floor it.
As for your carb its too large. Use a 600-650 carb. I'm pushing 625 horses at the flywheel and I'm only using a 700. A 750 has larger venturis which means your engine needs to try harder to suck enough air past the boosters to get fuel to be sucked out of the bowls, through the carb, and into the engine. This is the reason a larger carb runs great at higher rpms, but runs like crap at lower rpms. Will it run? Yes, but the streetablility wont be great, and unless your a really good tuner, you will have off idle stumble, and bad gas mileage. Being a DP makes things worse because its going to pump gas in your engine whether it wants it or not. \ /
/ \ That is what the carb venturis are shaped like. Its this shape that creates a vacumm as your engine draws air through the carb. Its this vacuum that makes fuel move through the carb. Its like sucking through a straw, I'm sure you can move a lot of soda through one straw, but try sucking soda through a hose or pipe. Harder isnt it? If your engine cant move enough air through the carb to extract gas then it wont run correctly in the low rpms and you may backfire through the carb or hesitate due to running lean. The good news is you are in better shape because you have a manual, but this only helps in drag racing because you can sit there revving it before dumping the clutch, but low idle cruising will create a problem. Go to a smaller carb. Hope this helps.

Hmm, I have a 600 CFM single pumper, not sure if that is anywhere near what you are looking for, I also have a 570 I beleive double pumper...

Quote by cqstang,
TrickFlow Trac-Heat Twisted Wedge Heads

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Do they really need port work?
saltymaz, I would think the better choose would have been a 750 (3310) with sec vac's. JMO......