Topic: Exhaust Manifold

[Mark69Sportsroof]

Hi Everyone,

I am trying to figure out the difference between two exhaust manifolds casting numbers.  My 73 Mach 1 right side cracked.  It has a 351C-2V.  I found one number of D1OE-9430-BA and the second is D201-8430-BA.  Doing a visual they appear to be the same.  Any thoughts.

Thanks Mark

[jwc66k]

What is the casting number of the one that cracked?

I found one number of D1OE-9430-BA and the second is D201-8430-BA. 

The second casting number is not quite correct, the molds used do get worn out. I think it should be D2OE-9430-BA.
Is this for a different 73? You said -

It has a 351C-2V.

- but your "signature" says 351C-4V. In any case, it should not make a difference between 2V and 4V engines.
Jim

[Mark69Sportsroof]

Jim,

Thanks for the info.  The second casting number could be an 8 or 9,  After scrubbing it some it is very hard to tell.  I do have a 4V carb on the original 2V heads.  With the thinner air we do get a little better compression then using 4V heads.  I'm not sure if 4V heads have a different casting number.
I am having the exhaust manifold with the cracked being repaired.  Of course the picture I have does not show that casting number.  So I should get it back on Tuesday.


Thanks Mark

[jwc66k]

When in doubt, look it up. From the 75 MPC:
Yr Carb       RH                LH
71- 4V D0AZ-9430-B D1ZZ-9431-B
71- 2V D2OZ-9430-B D1ZZ-9431-A
Apparently there is a difference between 2V and 4V heads.

- one number of D1OE-9430-BA - second is D201-8430-BA. (my D2OE-9430-BA)

I would guess the second (D2OE-) is a 2V head.
Jim

[Mark69Sportsroof]

Jim,

I'm currently looking at the MPC as we text but haven't found it yet.  Trying to verify the correct casting number for the right side for the 2V.

Mark

[67gta289]

It is located in section 94 page 10.

If you have a complete copy purchased from a typical retailer, look at page 1756 that will get you there, or at least close.

If you are using the free squarebird site (sounds like a Lynyrd Skynyrd thing there) go to the "13" fuel system link in the "text" area.

But the information that Jim provided is accurate and complete.

Also you won't be able to verify the "casting number" because it is in this case different than the "part number", the latter being what the MPC will list.

A casting is a huge expense, and when possible the same casting would be used for more than one unique part to save money.  After casting there could be machining (in this case there is), and there might be two or more variations, resulting in more than one part number.  In some cases, other components could be added to a casting (a brake master cylinder for example) which could result in quite a few part numbers using the same casting.

This is why Jim said that "I would guess the second (D2OE-) is a 2V head."  He was looking at the MPC listings for the 4V, which both started with a D1ZZ prefix, whereas the RH 2V started with D2OZ.

The Mustangtek web site, while not perfect, does a decent job of associating pictures with part numbers and occasionally casting numbers.

http://www.mustangtek.com/exhaust/Exhaust.html

There is also a discussion on casting and part numbers here:

http://www.mustangtek.com/FordDecode.html

[Mark69Sportsroof]

Sorry for the delayed response.  The shop that repaired it took three weeks instead of the one as they promised.  The one I took off is D1OE-9430-BA.
The one I got from the junk yard (D2OE-9430-BA) has the same size port holes.  I put it on the car and fit like a glove.  I will save the repaired one.  Thanks again.  Mark 

[Mark69Sportsroof]

I did one difference while putting the heat shields back on.  Using the D1 manifold the top bolt above spark plug # 1 needs the 1/2" spacer.  The D2 manifold does not because the cast iron top bolt hole is 1/2" thicker.  Otherwise no other differences .  Mark