I got a quick question I've dome some research and have read a few threads. I was just wondering about how much HP would my 400 be putting out if I ran headers weiand intake and either a holly 600cfm or edelbrock thunder series 600cfm I'm debating on cam if I really want to tear in to it

 

You might gain about 30 hp over stock at the rear wheels.

 

What would it take to get around the 300 mark?

 

headers, cam, intake, carb....

 

So throwing a can in there will make that much of a difference if the right one was chosen

 

Two things kill power in a stock 400.

Low compression--fixable only with different pistons

Cam--fixable with a new cam and perhaps springs etc.

More:

351M/400 Performance Build Up

Bubba's M-Block Ford V8 Workshop

M-Block 351M/400 Parts Reference

Source for parts, especially pistons:

Ford 400

As for 300 hp, you will not get that with cam alone.

 

I realize cam alone won't archive that I was saying a combo of 4bbl intake and good carb setup and headers would archive it

 

What would be total HP with intake and headers around 200?

 

What would be total HP with intake and headers around 200? Or would it be lower

 

Horsepower = Torque x RPM.

To get more HP, all you need to do is to increase the RPM of the motor. Unfortunately most things that increase the RPM of the motor kill the torque. The worst culprit is the cam.

Torque is the result of volumetric efficiency and dynamic compression ratio. High RPM cams kill the dynamic compression ratio.

To use a high RPM cam you must first increase the static compression ratio, so the dynamic compression ratio is in the right area for the fuel that you are using.

You can increase the static compression ratio by changing pistons or heads.

A good intake manifold and headers, along with a conservative high lift cam is all that you can do without tearing the engine down. This is especially true on a 335 series motor because of the piston-down-the-hole problem. Even changing the heads without changing pistons won't produce a great benefit.

 

I keep thinking it wrong I want to get at least 250 HP and I want neck snapping torque thanks for clearing my mistake. I just want to make my 77 project turn heads when I stomp the throttle it'll be mostly a weekend driver and mabey see a mud puddle or 2

 

It's hard to get what you want with bolt-on goodies. Your need to increase the compression first. A set of Aussie heads will help, but pistons & heads are the best options. A supercharger is another option.

 

Is there even a supercharger kit for this motor? Well I'm kind of non a tight budget I just want a little more power like a good intake and headers. I might go with a cam also

 

I have never seen a supercharger kit for a 351M/400 motor. I know that there have been some blown 351C motors built. I haven't researched superchargers, but I would look at Pro-Charger, if I were looking for one.

Start with a manifold, headers & a carb, if you are on a budget. That will get you some performance improvement, skip the cam until you can afford a serious upgrade.

 

That's what I'm going to do thanks guys