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I bought a '79 f150 as a donor truck for my solid axle swap on my bronco and i'm trying to sell the motor on craigslist and i dont know what it is. I thought it was a 351 cleveland but some guy sent me an email and said that didn't come in those trucks, only the 351M and 400 came stock in the 4x4. Is there a number stamped on one of the heads or block somewhere that will tell me what it is? if so how do i read it?
 

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Since the 351C was discontinued in 1974, it probably wasn't the stock engine in your 1979 truck.
Here's some casting numbers:

 

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Some pictures would help...and if it is a "M" engine, to be sure i always drop the oil pan and identify the difference of a 351M and a 400 by the casting # on the crankshaft.
I was ready to buy a 400M,... and after i had the fellow drop the pan it was a 351 crank...
 

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just out of curiousity where are the numbers on the block does anyone have a pic?
 

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Unless it has been swapped it is a 351M or 400M they have the same heads as the Cleveland so looking at one they look alike. They cam with a sticker on the drivers valve cover but that is probably gone. Dont know the casting numbers, sorry
 

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i checked my numbrs on my block just for s n giggles and when i was looking at the chart i noticed the 351 m and 400 numbrs on the block are the same so i am guessing the only real way to tell if its a 351m or a 400 is the numbers on the crank
 

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i checked my numbrs on my block just for s n giggles and when i was looking at the chart i noticed the 351 m and 400 numbrs on the block are the same so i am guessing the only real way to tell if its a 351m or a 400 is the numbers on the crank

Or pull a plug and stick a pipe cleaner or dowl down the hole and measure the stroke. 3.5"=351M and 4"=400.
 
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