carb?

[1fastsrt]

I have a stock 318 that I am going to gasket match the heads to the 340 4bbl intake(was free). I had a friend give me a edelbrock 1407 (750cfm) carb to use on it. I know I dont need more than a 650 at most right now but will the 750 cause any issues while driving? Also, could I just swap out the jets to not throw in so much fuel into her? New to carb tuning so any help is greatly appreciated. Thanks

[dwc43]

That's perfect for your car. The stock carb was an 800 cfm Thermoquad. That would be ten times better than an edel, but it should work decent for you. You need to jet any carb to any engine you mount it on no matter what it is.

[TK]

Yeah, ten times better..............I don't agree with that, but, it will work OK. More than likely you will need to go down 2 sizes on the secondary jets, one size on your primary's, and a 7 inch (pink) spring.

At least it should be a good start, the stock 750 will be too rich.

[rumblefish360]

You have a problem here. The 750 is to big but tunable to your needs with small pitfalls. First things first, you need instructions. Edelbrock.com should be your first stop. Find instructions there on your carb and print them.
Click here please; http://www.edelbrock.com/automotive_...ess_main.shtml

Your second stop is above here in the tech section where theres carb tuning instructions.
http://www.moparchat.com/forums/showthread.php?t=56571

Now on your stock carb DWC says it came with. The T-Q has very small primarys. It makes for a high velocity fine mist which translates into a good burning mixture for gas mileage and power.
The other thing about the T-Q, when you go to a wide open throttle position, the secondary door opens slowly for the 318 to keep up velocity. But the door is limited in it's opening.

On the 750, the primarys are almost equal in size. There in lies the problem. Your going to need to play with the jetting and pump shot (Duration time I think) to cover up the large throttle bores sudden opening. The sudden opening will cause fuel to fall out of suspension and hit the floor causing a big dead spot and possible stall. Your secondary doors are not tunable unless you don't mind taking them out to add or delate some weight to the counter weights so that a fine tuning is possible.
On the T-Q or AVS, it's just a spring loaded door that gets adjusted by a screw driver.
Truly, a bone stock 318 can usea 550 cfm 4bbl. carb and it would work absoultely great.

[1fastsrt]

Thats was some great links there Rumble...thanks. Looks like Id be just better off selling the 750 and going with a 600, maybe 650. I think it would save me alot of time and hardache.

[Jim13]

Yea, thanks Rumblefish. That info is now saved on the hard drive.

[rumblefish360]

Your welcome guys. DWC's T-Q's love isn't bad, just on CFM's, it would look like the 750 would work since the T-Q was 800. The T-Q is a little tuff to learn because it is a bit different. There very good for the street and when you get good at them, race car prep isn't to hard.
DWC will tell ya that.
The other problem is intake seclection for them. A spacer helps in getting it on the intake, but I'm not a big fan of "Making things work" with spacers.

[dave571]

Originally Posted by 1fastsrt

I have a stock 318 that I am going to gasket match the heads to the 340 4bbl intake(was free). I had a friend give me a edelbrock 1407 (750cfm) carb to use on it. I know I dont need more than a 650 at most right now but will the 750 cause any issues while driving? Also, could I just swap out the jets to not throw in so much fuel into her? New to carb tuning so any help is greatly appreciated. Thanks

I would throw it on as is, and see how it runs.

I'm not a big fan of the eddy carbs, BUT I will, say that the strong point of them is, that usually you just throw them on, and they work. Even in a situation where the carb is waaaaaay too big, like this one.

I agree with rumble's advice and recomendations also. The weighted air door on the performer carb is a pita to manipulate. Especially since you would want it to be heavier for your car (,so it would open later) Removing weight from things is easy, adding isn't.

I think you'll find that with regular driving it will run fine. It will have some wot issues that will virtually impossible to tune out, but regular day to day they shouldn't bother you.

[TK]

Even on the 600's, if it is on a 318, I have the machine shop drill and add weight to the door.
Seems even the 600 overcarbs most 318's.
Next Edelbrock I buy, for a 318, will be a 500.

[rumblefish360]

dodgetruckboy, your about dead on with that. A smaller carb does do better for stock 318's or with ild work done to them. Beefier 318's can go 600 without a problem.