A trivial thing, but isn't "G" for August?

 

too late to edit , you got me! i guess i missed a finger there somewhere? end of august is getting close to the next model year production, when do the new ones start showing up? september? might have to scrape the build date next to the timing pointer to really nail it down, but i doubt that it makes much of a difference.

 

Cast in 76, the engine could be a 351M or a 400.

 

Pull a plug, insert a wood dowel, crank by hand and mark TDC and BDC on the dowel. Measure the difference between the BDC mark and the TDC marks on the dowel. Should be about 3.50" for a 351M and 4.00" for a 400.

Does this get it?

 

"Does this get it?"

Not on a 335. The spark plug hole is at such an angle that you can't get a wooden dowel inside the cylinder.

 

All 335-series (351C/351M/400) engine blocks have the casting ID code on the lower right side, below the deck, toward the rear of the engine. The casting ID code always identifies the engine block type (e.g., 351C or 351M/400).

At a minimum, the casting ID code includes the Ford part number prefix (such as D1AE or D7TE) and a revision level suffix (such as A, A1, or A2C). Sometimes, the casting ID code on the block includes the part number for the raw block casting, which is 6015. However, that part number is common to all engine block raw castings, so it does not help identify the block type.

Check out this page for more info about M-block (351M/400) block casting codes.

http://home.earthlink.net/~bubbaf250/parts/parts02.html

Note that the location of the block's casting date code varies by foundry. On blocks cast at the Cleveland Foundry (CF code), the casting date code is located in the same area as the casting ID code (lower right side, toward the rear). On blocks cast at either the Dearborn Iron Foundry (DIF code) or the Michigan Casting Center (MCC code), the casting date code is located on the top rear of the block, next to the oil pressure sending unit port.

Ford date codes up to the late '90s (including casting date codes), use the format described previously by gclark351.

Unfortunately, casting codes (both ID codes and date codes) are sometimes partially obscured or illegible, which can lead to some confusion. In the case of the date, you can also look for the engine's build date code (identifies the date it was originally assembled at the engine plant), which is stamped into the machined front face of the timing chain housing on 335-series engines. The build date is usually within two weeks of the casting date.

Since engine block casting molds were typically used for more than one model year, the only clues to exactly when the engine was manufactured are the casting date code and the build date code.

So Bob, what about the height of the engine block's front intake manifold flange?

Is it almost flush with the timing chain housing at the front of the engine, or is it raised significantly above the housing?

Once you've identified the engine as a 335-series, the height of the front intake manifold flange is the easiest and most obvious way to determine whether it's a 351C or a 351M/400.

I've never heard of a 351C block casting ID code with the D1AE prefix. I'd bet that Bob's D1AE block is a '71-'73 400 (which could have been rebuilt as a 351M by swapping the crankshaft and pistons).

Check out this page for an explanation of why you can't just measure the stroke through the spark plug hole to reliably distinguish a 351M from a 400:

http://home.earthlink.net/~bubbaf250.../parts110.html

 

bubbaF250 the manifold is raised and it has a web on
the engine block like the engine block photo archive
of the 77 motor.

 

The 351c doesnt have a timing chain cover, its just a flat plate behingd the water pump that bolt to a housing for the timing chain. Look at the valve covers also, if they are form a 351c they will be flat level with the ground and then turn to be level with the heads if it is a C. Also look at the head on ther driver side at the top corner by the intake, see if there is a 2 or a 4 stamped on there. If there is you def got cleveland canted valve heads, and hope you got the 4 cuz they are monsters, but the 2's are good to (2.05 intake, 1.66 exaust valves).

 

Doesnt the 351- 400m usually have the "m" in the top of the head generally at the front of the motor

 

Not on the early castings. The first few years of 400s had a blank spot there, while the Cleveland had the "2" and "4".

 

Got the numbers of the head they are D1AE AC 15 in the corner
104 DIF

 

Ford didn't use the letter "I" in part numbers and date codes )probably VINs too)because its easily confused the the munber "1"
http://www.classicmustang.com/decoding_part_numbers.htm

 

The easiest way to tell a 351c from a 400m is the width of the intake manifold. The M engines were wider than the C's. I'm not sure what the widths were but maybe someone can measure theirs for you.

 

Could be wrong, but it doesn't appear to be a Cleveland by the casting mark alone. As far as I know ALL 351 Clevelands were cast at the Cleveland Foundry; 400s were cast at the Cleveland Foundry, Michigan Casting Center, and Detroit Iron Foundry, hence the "DIF" on your head - Detroit Iron Foundry. I'd say those are 400 heads. I've never seen a true 351C that was cast anywhere but the Cleveland Foundry.

 

Hi all there was a 1973 Mustang at the cruise last night with a 351
cleveland I look at it to see the intake on it there is a lot of differnce
in the 351c. and the 400 or the 400m.