I planning on buying a 4-barrel carb. I was thinking of getting a Edelbrock Performer Manifold and a Edelbrock 750 cfm Performer Carburetor. Is that a good carb or should I go with a Holley? Im putting it on a 400m engine.

I also have another question. Is there a big difference in proformance between a 600 cfm and a 750 cfm.

Any comments would be appriciated.

 

Bob, The Edlebrock is a good carb. It is a Webber, made for them. Unless your engine is not stock the 600 should deleiver as much gas as the engine needs. Most of the Ford engines come with two barrles anyway.

John

 

Bob:

At 90% volumetric efficiency, a 600CFM carb will take your 400M to 5,700 RPM. Unless you do a lot of heavy hauling I would stay with a 600 CFM carb because it will give you better throttle response (torque) at lower RPMs.

I have a '71 F350 with a 400M, older Edelbrock Streetmaster 400M intake and Edelbrock 1406 carb rated at 600 CFM.

The engine is very responsive and I have no complaints about the induction. Also try replacing your ignition system with a MSD 6A to get more voltage and current to your plugs.

Bruce

 

Would the 600cfm also be the right choice for a 460? I would desire pulling power/reponse over high rpm horsepower.

 

Yup. The Nascar Busch cars only run 390cfm carbs.

John

 

What would I look at paying for a new MSD 6A ignition setup for a 400 78 f250 4x4?

Matt

 

Summit Racing Cat. $130.00

John

 

Bruce,

How does your 400m start with that edelbrock carb? I've had a few of them, on a few different vehicles, and they've all seemed to require a lot of cranking to get the engines to start. Almost like the bowl drains when you shut the engine off. On 2 vehicles I tried a holley to compare, and both of them fired up significantly faster. Just curious if yours is the same as mine were. I'm in the market for another induction setup, this time I'm thinking weiand intake, with a holley 600cfm. Just to try somthing different I suppose.....

Steve

 

I'm new to this stuff. Is it hard to install the MSD 6A? How long does it take. Do you need any speicial tools.

 

Will th MSD 6A work with my distributor or do I have to get a different one.

 

Bob:

I'll make this as short as possible.

In '95 I bought a '77 Ranchero for $300 as backup transportation. It had a broken cam. I rebuilt the 400M and had the C6 rebuilt. Since then my wife & I have driven it less than 1,000 miles because of other mechanical and electrical problems. In 1996 I bought a used Edelbrock Streetmaster 400M intake but couldn't install it because of smog laws.

In June I bought a '71 F-350 whose 390 went bad and the owner was attempting to install a 460. He lost interest and I bought it for $1,300. It's a rust-free California truck with no damage and in good shape. I transplanted the 400M and C6 from the Ranchero into the F-350. The '71 F-350 is smog exempt so I installed the Streetmaster intake and a 600 CFM Edelbrock 1406 carb.

I also bought a MSD 6A from Kragens to install because I've had very good luck with them in both my '68 Mustang with a 289 and my '84 Bronco with a 302. It cost $130 and they had to order it. It took one day to arrive.

Since I'm new to working with the Duraspark II ignition, I carefully read the installation instructions. It appeared that the MSD 6A replaced the Duraspark module. To be certain I called MSD and one of the tech. reps. confirmed that the 6A replaces the module so I left it in the Ranchero.

It took me about 1-1/2 hours to install the 6A on the F-350 using the magnetic leads from the Duraspark distributor. You have a total of about six or seven wires to install. The only tools you need are a drill and phillips head screw driver to mount the 6A and wire stripers/crimpers.

I don't like to use crimp connectors anywhere where the wires are exposed to the elements so I soldered all my wire splices and used shrink-wrap for the solder joints. Where I needed to use a washer-shaped lead on the end of a wire, I crimped and then soldered the lead to the wire and used shrink wrap to protect the solder joint.

I attached the large hot wire directly to the hot side of the starter selenoid and the large ground wire to the negative terminal of the battery. You must make sure you have a grounding strap from the engine to the chasis and that its connections are clean. If not you will get a lot of radio interference. I installed the 6A box on top of the passenger-side inner fender about an inch from the hood hinge, being careful to keep all wires away from the hinge.

I used the stock coil from the Ranchero. I used the plastic cap that clips to the top of the coil and makes contact with the coil's leads. I just trimed the wires I didn't need and attached the other ones to the 6A.

Steve, with both the Edelbrock carb and the 6A the engine fires-up very quickly and runs very smoothly. In my '68 Mustang I have a similar setup: and Edelbrock Performer 289 intake, Edelbrock 1406 carb and MSD 6A. I also have a Mallory Unilite distributer and Mallory Blaster coil. It fires up first try if I have driven it within the past day or two. It takes 5-10 seconds of cranking if it's sat for more than this. Before I installed the 6A I would sometimes have a devil of a time starting the Mustang because it would flood so easily. This was especially true on cold mornings if it wasn't run the day before. The 6A cured this problem so I must assume that I wasn't getting enough spark. I had the same problem with my previous carb., which was a Holly 600 CFM. Switching to the Edelbrock carb didn't fix the problem but the 6A did.

In my '84 Bronco I installed both the MSD 6A and their Blaster 2 Coil. It now starts a lot easier, idles smoother and has more power. I got about a 1 MPG increase too.

Hope this helps.

Bruce

 

Oops

My Mustang has a Mallory Pro Master coil.

 

 

I just finnished putting a new 400 m in my 79 f250 4x4 sc. I used a performer intake and the 600 cfm performer carb. and it ran perfect right out of the box and I have a little more cam and compression then stock.
Plus if I keep my foot out of it I get better milage.

 

I can't believe a 7 year old post replied to .....that should actually be in the 335 engine forum.

Welcome to the site !


For the record !

Actually there is NO such thing as a 400M.

There is a 351M and a 400

The 351M is de-stroked 400 making it the 351) the Modified engine,