351m whats the difference?
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The casting codes will be the same for all 400s cast in a given year. It does not matter what bellhousing they have.
Elder User
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From: Sin City, USA
Thanks for the pictures. I do not claim any of the Ford books are right. It is just all I have to go by. I am still looking for the 400 4V that they claim was made in 1971 with 4-barrel carb and intake (260hp & 400 ftlbs). There was a "stock" 4 barrel cast iron intake for a 400 that showed up on e-bay a while back, but no one proved that was what it really was and it sold for a good bit of money.
You are right about the D1AE and the D3AE. All of the ones I have seen (all 4 of them... so not many) were D1AE castings. The D3AE are reported by Tom Monroe in his "Ford V8 Engines" where he claims he tried to swap in a 400 (D3AE) from a car and found it had the small bellhousing. He claims however that 1973 was the only year for the small bellhousing.
You are right about the D1AE and the D3AE. All of the ones I have seen (all 4 of them... so not many) were D1AE castings. The D3AE are reported by Tom Monroe in his "Ford V8 Engines" where he claims he tried to swap in a 400 (D3AE) from a car and found it had the small bellhousing. He claims however that 1973 was the only year for the small bellhousing.
Monroe's book is a mixed bag. There may be a bit of truth to the tale that the small bell 400 was only used in 1973. Of the 10 I know of, most came out of 1973 vehicles.....the others were found on the ground.
Elder User
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From: Sin City, USA
The codes will change with revisions to the basic design. Hence the D1AE-A2C. The suffix of A2C is the revision code so there are A, AA, AB, AC, etc.,... but not all revisions are released separately nor are the revision codes neatly sequential. The small bell blocks should have it's own unique revision code. All the ones I've seen are A2C blocks but I have not seen a big bell only block that was a D1AE-A2C....we are talking about Ford so I could be wrong as I've only seen a few hundred blocks out of millions Ford cast.
Junior User
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The A2C casting also have the material cast in place to be mounted to a big block tranny as well. There could be a lot of A2C casting that were tapped and bored for the C-6 transmissions. The A2C was cast to be used for either application. If you look at your pictures there is a casting above where your bellhousing attaches that would have been tapped at the corners if it was going to have a C-6 behind it.
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351??? - FSB Forums
If you look at this link and scroll down you will see a 400 with the small bellhousing. D1AE casting. Which makes it a 1971 block.
If you look at this link and scroll down you will see a 400 with the small bellhousing. D1AE casting. Which makes it a 1971 block.
Anyway, it doesn't matter. I still can't get Pantera people off my back about my '73 400. No one is local or willing to pay to pick it up or ship by small pattern 400, but they are still hounding me about it.
I'll have the Roast Duck
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From: Northshore, MN
right, even though it may be cast with a D1AE and a suffix A2C, it is still a casting code, and not the final machining number. Also don't forget that even though it has a D1AE casting, it still could be machined in 1973 before any engineering change that would require a different casting code. Gotta love Ford and their vagueness, lol...Still doesn't compare to old IH trucks and how they titled them, lol.
Elder User
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From: Sin City, USA
The A2C casting also have the material cast in place to be mounted to a big block tranny as well. There could be a lot of A2C casting that were tapped and bored for the C-6 transmissions. The A2C was cast to be used for either application. If you look at your pictures there is a casting above where your bellhousing attaches that would have been tapped at the corners if it was going to have a C-6 behind it.
Posting Guru
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and thats what i ment when i said i have the cating on my block D3AE A2C, and i had read the revision code A2C standed for the small bellhousing in 73 400s...
Please post the pictures of the 4bbl 400!!
Please post the pictures of the 4bbl 400!!
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Junior User
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So you have a D3AE-A2C block with the small bolt patern?
Elder User
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From: Sin City, USA
The blocks I've seen and the one I own is a D1AE-A2C. I've never seen a D3AE-A2C and I think Monroe claimed the D3AE was a -BB revision or -AB....but i'm sure he didn't list D3AE-A2C.
Junior User
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He does not list a code for the block. PHB-AD is the transmission code he lists.
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