surfshark

I want to put my 300HP 350 back in my car until I get a 406 built and I have to buy a carb/intake for it. I don't want to buy a 650cfm and then turn around to buy a 750 for the 406 once it's ready.

My question is, can I get away with using a 750 with an Edelbrock RPM intake, stock camshaft, and 041 heads in the 350 for the time being, and then put the carb (and the intake) on the 406 in several months? I have a 3.73 rear and 2300 stall converter. I don't want to spend the money on a bigger cam and springs, etc. for the 350 either since it comes out in a few months. Thank you for any help.

MEGALADON

I don't see it being a problem, unless it's a double pumper

mandm1200

It may be on the large side buy it shouldn't warrant buying another carb until the bigger engine goes in.

surfshark

Thanks. I'm considering the 770 Avenger.

Yellow73SB

I put a highly modified 750 double pumper from a late model and dam it ran so rich. but a regular 750 should be fine.

anmracing

Do you mean the double flusher????

Andrew

Michel B

I'm not a pro but from what I read it should be no problem, but don't think that you can put any carb stock out of the box without fine tunning it. Ya a lot of people do this a get away with ok performance, but probably don't realize what a well tunned carb can do. In my experience, I have a 750 edelbrock on my 327, yes it did run rich at the biggining, I got myself a tunning kit re-jetted, studied it and played around with it until I got what I wanted, I would'nt trade it for anything else.

GrandSportC3

Why would it be a problem with the double pumper??

I used to run a mech. secondaries 750 double pumper on a 327/250 HP and it worked just fine... As long as it's properly tuned, there is no problem.. Just ask Isoceless.. He's using a 750 mech. secondaries double pumper race carb on his L-48 and he picked up over 1/2 second on the 1/4 mile vs. the q-junk carb... Well, his fuel economy suffered but if you are concerned about fuel economy, a C3 isn't really the right car to own

lars

Nothing wrong with a 750 double pumper on a 350. No problem. I run a 750 DP on a mild 350 and it runs absolutely great. I've also run 850s and 1050s on my 350 with no problem. Big carbs running rich is a complete myth: Big carbs actually tend to run lean due to decreased fuel metering signal.

surfshark

Thank you all very much for your input. I'm excited about putting the 350 in and to just drive the car again. I'll start collecting parts for the 406 build. The 750 and intake will be part of the "collected" parts that I can use in the meantime.

MoneyPit

Man, how can a dummy like me answer after lars. Anyhow, I had a racer here explain it to me pretty well, just as lars said above. There really ain't no such thing as too big a carb. You just have to jet it down some, but I am no expert.

mandm1200

So you're saying that it should not be a problem to put 3 or 4 (or maybe even more) 750cfm carbs on a 1.8L engine. Afterall, there isn't TOO MUCH. There is a limit when going with more cfm is not not better, aka too big. The 350ci engine will run fine with a large range of carbs. Some will perform better at lower rpms will other will perform better at high rpms. How the car is used will narrow that range. A 750 will work without a problem. A 650 or 600 for dailey driving on the highway or through town would be a better choice, excluding Qjet or similar carbs due to the small primaries/ large vacuum secondaries. Going with the correct (and there will be several) carb is as important as picking a camshaft. There is no need to pick a cam with 300* duration, .600 lift to drive in city traffic. Of course, the same guys who say there is no such thing as to big of a carb will also think, but not say, no cam is too big.

MoneyPit

mandm1200,
Dude, I guess maybe I should wink or something like that when people ought to use a little common sense when I am using a little humor. Sure I guess that 3 or 4 (or maybe even more) 750 carbs on a 1.8L engine is TOO MUCH. Besides, I would not even no where to get a manifold to hook up 3 or 4 (or maybe even more) 750 carbs to a 1.8L engine. If you run across one, shoot me the link, I will check it out. I was just trying to say, inside the bounds of all things decent and good within the holy grail of carbdom, that the 750, or maybe even a little more, would not be too much if properly adjusted, but as I said in my post, I am no expert.

Brettmc

Just get the 750 DP, you'll be glad you did....

Brett

mandm1200

No problem here. But the quote everybody goes by is 'No Carb Is Too Big". It seems as though we may be in the minority. There actually is a limit to how much carburation can be tolerated. I'm sorry if I choose your post to make my point. Anyone with common sense knows there are carbs 'too small' and carbs 'too big'. No one would run a 100cfm cabr on a stock 350 and expect it to crank out 6500rpms under load. Nor would I expect an 850 cfm carb to give great throttle respose at 1400rpm in high gear. I'm not the one who said no carb is too big. Either you stand behind it 100% or don't keep saying it when you know there is a limit. Just say there is a limit, but XYZ cfm should work OK but may not be optimal. Just because Lars says no carb is too big doesn't mean he believes there is no limit. Even a man of his knowledege realises there are two extremes.

Brettmc

There is a context here. A 300hp 350. A 750 will be fine on that motor.

Federot

Cali,68,L-79

i have a L-79 (327/350hp) 11:1 with a 750 BG Double pumper prepped by LARS AND IT ROCKS! It's all about jetting. IM LARS don't listen to the BS.

MoneyPit

I will let it go at this. First, I will let lars speak for himself. Go back and re-read my post, I merely concurred with his post by adding that a person that I respect gave similar advice to his. Second, I guess I will have to leave any tongue and cheek comments out, b/c I guess someone will come along and point out that there is a limit to everything. To satisfy the carb police: Surfshark, "There is a limit"(3 or 4 (or maybe even more) 750 carbs on a 1.8L engine is TOO MUCH), but a 750 cfm should work GREAT, or optimal or whatever it is that I SHOULD SAY.

mandm1200

Sounds like a cop out. You say one thing "No Carb Is Too Big", then sort of say there is a limit. Lars spoke for himself in another thread. Perhaps you missed it and only want to repeat his normal response "No Carb Is Too Big'. There are too many forum members who are parokets. They get trained to say certain things. You posted 'There really ain't no such thing as too big a carb', then say come back and try to say there may be such a situation. Don't sit on the fence and be wishy washy. Either a carb(s) can be too big or anything can be made to work across the power band. I don't think Lars would even agree there is not upper and lower limits, but I'll let it up to him to respond even though he is one one of the famous 'No Carb is Too Big'.
As for this thread, I did reply that the 750 should work. Might not be the best choice, but it'll do.