1979 ford 351W top end parts

Can anyone tell me if 351M/400 2V heads will work on a 351W? What intake can I use? Does anyone make and adapter plate to mount 351W headers on a 351M/400?


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I believe you can make a set of 351m/400 heads work on a windsor, they are basically the same as a cleveland, (I think there are a few minor water passage variations between the cleveland/m motors, but I could be wrong) it's pretty much the same swap as a 351 c head onto a 302/351. Read up some here about intake manifold availability and the cleveland swap.
http://www.mustangandfords.com/tech...gine/index.html
http://www.themustangshop.com/clevor.cfm

IIRC you need to run different pistons, the valve reliefs are different in the windsor pistons. The cleveland style valve needs a relief off on the side, while the windsor needs reliefs towards the middle.

Headers...I don't think there are any adapters, and if there were, I wouldn't want to use them. It would add too much to the width of the already somewhat wider motor, and it would dump a big exhaust port into the smaller windsor dimensioned header...

Why do you want to do this swap, and what is the car/end use? There are some really good windsor heads out there.

Later, mikey

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yea you can put the 351m/400 heads .with alot of machine work. but they really wouldnt be worth all the money and time to do it. as far as a adapter plate to mount windsor headers on the m/400 never seen one to totaly different heads.even if they did i wouldnt do it.just what are you working on anyway let us know more about what you have and what you plan on doing with it . are you trying to build a boss clone engine? cole

You have to plug up and drill two new water jackets in the 351M/400 heads. Then you will need a intake manifold for a 351W using 351C 351M, 400 heads. You will need to change out your pistons to a canted valve style, the valve reliefs on the 351W won't work with 351C, 351M, 400 heads. Then you might consider changing your cam to a 302 Boss style, the 351W will work but not real good with canted valve heads. You will need to use rockers for 351C, 351M, 400 engines and you will need to get a set of custom push rods, the 351W push rods won't work. So after all this is done and said, you could get a descent set of after market heads for a 351W that would run circles around what you are proposing.

Here is a pic of a low compression 69 351 w piston


here is a pic of a stock replacement 69 high compression 4v 351 w piston top..(yes it's gross)


Here is a pic of a 70 4v cleveland piston. Note valve relief.


Here is a pic of a 2v 351m/400 exhaust manifold gasket laying on top of a 69 windsor exhaust manifold. I was not sure of the front back orientation, but you get the idea..


The windsor manifold bolt holes are almost in the port area.

Later, mikey

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__________________
my signature lines...not really directed at anyone in particular..

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No one is completely useless..They can always be used as a bad example

It cost a lot of money to have stainless shorty headers made for the 400. Since no one makes stainless shorty headers for a 351M/400? I need shorty headers to fit in the boat for water injection cooling. The exhaust will exit through the back of the boat through flaps. I got the 400 heads for free and they are real nice. I want to run low compression and the 400 heads have open chambers D5AE 2A I think 78cc. Are the 351C heads the same as 351M/400 heads? Does the 351C 2V heads have the same intake pattern as the 351M/400? http://www.pricemotorsport.com/ has adapters for 351W intake to fit on 351C heads on a 351W block.

If you are going to buy adapters run a windsor intake, and try to run windsor headers, (make an adapter?) you are not going to gain much, if anything over just building a set of windsor heads and bolting them on..
I used a set of adapters on a 400 block with 4v cleveland heads and manifold one time..they sucked, messed with the flow through the port, (put several new and obstructive angles in the flow of the port) and took a bunch of work to install.

Later, mikey

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my signature lines...not really directed at anyone in particular..

BE different....ACT normal.

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Thanks powerrodsmike for the pictures and the links. I found aluminum valve covers on ebay. u have a lot of good information. I want the low compresion low rpm motor with a big sound and some torque.
The info. is good thanks onebadmerc.
Remember I am putting this in a 1979 24ft offshore SeaRay.
Does anyone sale 351 C 2V header flanges, and I could make my own headers.

This guy has them. but hooker should also have them about any header co. should be able to help. but this guy has the custom kits . http://www.headersbyed.com/__ford.htm . hope this helps. Cole

That is an awful lot of work to take such a big step backwards. The 400 heads aren't worth doing this even if they are brand new and free. All that work and parts changing/fabrication (and $$$$) to make less (actually a lot less) power and torque than a set of Iron Dart heads for the Windsor.

The 400M/ 351 2V head is the worst head you could consider using. Large, Open detonation prone chamber shape with no quench surface at all l. Australian 2V or closed chamber 4V are the only ones worth using, and you still have to change pistons, pushrods, intake, exhaust, and have the heads modified for the correct coolant flow path.

There are times when free or "good deals" are just not the deal they seem to be, and this is one of them.