I found the casting numbers on the motor by the starter
the are D14E-6012-C how do you tell if it is a 351 cleveland
or M 400

 

its a 71 motor.
if the intake is about an inch above the flat part or the block next to the dizzy then it is a 351M/400.
the 351M/400 has about inch taller deck.
http://home.earthlink.net/~bubbaf250/index.html

 

the 351m wasn't even made then so its down to a 400 or 351c.

 

No 351Cs in trucks.

 

by the part mumber its from/in one of the cars.

Comet 1971-74;
Monarch 1975-80;
Cougar 1981-82;
Marquis 1983-later

 

The casting numbers on the motor are D14E-6012-C
or 6U12-c
is it a cleveland or a M400

 

i think you are a little fuzzy on the numbers? D1AE is a common casting code for Clevelands and 400's, probably W's and others. the other number you have there, 6U12-C, i think that's your casting date code. the "U" doesn't make sense though, that digit is for the month of the year. A is january, B is febuary and on. I is not used. M is december, there aren't enough months to get a "U", could it be something else? to differentiate a C from an M, i would look at the front of the intake right behind the distributor like F150daniel suggested. most but not all M's have a 1" high rib of metal standing up to the right of the distributor, and the intake is a good 1" higher than the top of the block near the distributor. a Cleveland intake is about flush even with the top of the block near the distributor.

 

Block casting numbers:

351C-2V ('70-'74)351C Boss ('72-'74, '71 CJ & HO, '72-'74 4V)351M ('75-'80)400 ('71-'80)400 ('73 w/351C bellhousing pattern)Does this help?

 

my C is a D1AE, i don't think we can go by the cast code to ID between a C and a 400?

 

The 351C intake manifold mounts flush with the timingchain cover. The 351M/400 is about 3/4" higher. Also, the 351M/400 has a 1" high web extending straight out from the front of the manifold surface just left of the distributer hole.

 

Once again, Ford likes to make us all look bad. My 400FMX block is casting code D1AE-6015-A2C. It came out of a '73MY.

--J

 

From Tom Monroe's "How To Rebuild Your Ford V-8", page 24:

 

Bubba is the man on this type of thing as it pertains to the 351M-400. Check his site for 351M-400 pics, and use the above guidance to see if you are indeed sporting a Cleveland. Here is the link to Bubba's photo archive. He has some casting numbers on his site as well.

http://home.earthlink.net/~bubbaf250/parts/pics01.html

Regards,

DiMora

 

marv0 the casting numbers are D1AE- 6G12-AC we look again today
now that it is dry and clean of all the dirt and oil.
it is a 400 1971 to 1980 I will call the Ford dealer and see what year
it was made.

Thinks Bob

 

the casting date says it was cast on 7-12-76