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  #1  
Old 02-17-2010, 10:16 PM
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351 or 400 crank?

Okay, I bought a 1980 ford f250 and the guy i bought it from said that it had a 351m in it. I went a looked at the vin number and it said that it had a 400 in it, but when i pulled the engine apart it had 351 stamped on the pistons. So we bought a 400 crank for it and built it to be a 400. Now i have a reason to believe that it was a 400 to start out with. I still have the original crank and if it is a 400 is it worth any money? Is there a way that i can find out if it is a 351 of a 400 crank?

Thanks in advance.
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  #2  
Old 02-17-2010, 11:09 PM
zaaac zaaac is offline
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TMeyer, Inc. Precision Automotive Machining

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  #3  
Old 02-18-2010, 08:32 PM
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If the pistons were stamped 351 on the sides why would you think it was a 400 ?
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Old 02-19-2010, 01:29 AM
85e150six4mtod 85e150six4mtod is offline
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If the crank is out of the engine, 3.50 vs. 4" stroke should be easy to figure.....
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  #5  
Old 02-20-2010, 02:00 AM
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serge duguay
Mesure the distance between the center of the crank to the center of the connecting rod. 4" is a 400 and 3.5" the 351m. The 400 as a ridge of about 1 inch at the first conterweight on the front you can feel with your fingers. The 351m don't have it. Also the 400 have 5M, 5MA or 5MAB casting number on the first conterweight. My 400 crank have 5MAB.
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  #6  
Old 02-20-2010, 03:19 AM
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Quote:
Originally Posted by mark a. View Post
If the pistons were stamped 351 on the sides why would you think it was a 400 ?
Because according to the VIN number it is a 400
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Old 02-20-2010, 04:02 AM
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serge duguay
Maybe you have a 400 with 351c flat top piston ? wich is good to raise your compression with stock head. stock 351m and 400 have dish piston. Can you post a picture of the top piston ?
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Old 02-20-2010, 09:28 PM
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I dont have the pistons anymore and i didnt take any pictures of the old ones. From what i remember, i dont think they were flat top, but i could be wrong.
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Old 02-21-2010, 01:40 AM
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Quote:
Originally Posted by mustang81 View Post
Mesure the distance between the center of the crank to the center of the connecting rod. 4" is a 400 and 3.5" the 351m. The 400 as a ridge of about 1 inch at the first conterweight on the front you can feel with your fingers. The 351m don't have it. Also the 400 have 5M, 5MA or 5MAB casting number on the first conterweight. My 400 crank have 5MAB.
What if there is just a 5 on the second counter weight from the back?
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Old 02-21-2010, 02:05 AM
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Quote:
Originally Posted by 1980 Ford F-250 View Post
What if there is just a 5 on the second counter weight from the back?
Did you look at the picture on the TMeyer website? That's all you need to figure out if it's a 351M or 400 crank.
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Old 02-21-2010, 01:15 PM
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Look at zaaac first post to identify your crank, perfect pics. 5 on the second conterweight from the back don't tell me anything, maybe connecting rod # 5. Are you sure your looking at the conterweight ?
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Old 02-21-2010, 02:00 PM
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personally, on a truck that was built in the 70's, i have learned from experience dont go on vin# and what was original. over 30 some years old so things are changed. my vin said it was a 400 when i bought it, but it had a 351 in it. but i ended up swappin over 2 a 400 to start out a build on. just my 2 cents though
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Old 02-22-2010, 11:24 AM
85e150six4mtod 85e150six4mtod is offline
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Quote:
Originally Posted by mustang81 View Post
Mesure the distance between the center of the crank to the center of the connecting rod. 4" is a 400 and 3.5" the 351m. The 400 as a ridge of about 1 inch at the first conterweight on the front you can feel with your fingers. The 351m don't have it. Also the 400 have 5M, 5MA or 5MAB casting number on the first conterweight. My 400 crank have 5MAB.
Crank throw is 1/2 the stroke. Crank centerline to rod journal centerline will be 2.0" and 1.75" for the 400/351.
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  #14  
Old 02-22-2010, 12:03 PM
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Quote:
Originally Posted by zaaac View Post
Did you look at the picture on the TMeyer website? That's all you need to figure out if it's a 351M or 400 crank.
I did. Is the 400 crank the one on the right? If it is, that is what my crank looks like.
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Old 02-22-2010, 12:24 PM
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Quote:
Originally Posted by 1980 Ford F-250 View Post
I did. Is the 400 crank the one on the right? If it is, that is what my crank looks like.
It is.
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Old 02-22-2010, 12:24 PM
 
 
 
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