351M casting number
New User
Joined: Jan 2008
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It doesn't matter because the engine was designed for a full size Ford car.
The 400 will also have the same casting numbers.
The 3rd digit will be an A and the 4th will be an E .
What is it you are trying to figure out ?
The best info is on a buck tag usually located under a mounting bolt for the coil.
Btw, this is an engine question and would be best posted in the 335 engine series forum.
The 400 will also have the same casting numbers.
The 3rd digit will be an A and the 4th will be an E .
What is it you are trying to figure out ?
The best info is on a buck tag usually located under a mounting bolt for the coil.
Btw, this is an engine question and would be best posted in the 335 engine series forum.
New User
Joined: Jan 2008
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Why not just order a 1971 400 instead ?
https://www.ford-trucks.com/article/...00_Engine.html
The only way to tell the difference is to measure the stroke.
https://www.ford-trucks.com/article/...00_Engine.html
The only way to tell the difference is to measure the stroke.
Last edited by Mil1ion; Feb 14, 2006 at 02:54 PM.
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Hello- Welcome to FTE! I have moved your post to the specialized forum we have here for your question. Check out the list of tech forums we have on FTE. There is a wealth of information and expertise here to help you. There are a number of links in my sig below to help you also. Have fun!
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From: chicago burbs
no changes at all. the only difference between the 351M and the 400 is the crank and the pistons, all internal. externally the engines are identical. if you need to have the proper emissions equipment for a visual inspection you should order for the year of the truck, otherwise the 71 400 should have more compression and none of the smog passages in the heads. or you could order a 71 400 short block and put the correct year smog heads on it yourself, it'll be better than a smogger long block. that is IF the rebuilder does use the flat top pistons(instead of dished) for a 71?
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