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Mar 26, 2005 | 05:25 AM

Rob Cuenin

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From: Palm Bay,Florida

engine swap

does anyone know if a 400 out of 79 lincoln is the same block as my 351m in my 78 f250 will this motor bolt up to my c6 tranny? blew up my 351m last week mudding.looking for a replacement thanks

Mar 26, 2005 | 06:07 AM

tasdevil1

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engine swap

If it's a 400M it is the same block. The crank is differant. It will bolt right in.

Mar 26, 2005 | 06:29 AM

Rob Cuenin

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From: Palm Bay,Florida

how do i find that its an m motor ? the head has an m stamped on the front of it like the 351m?

Mar 26, 2005 | 07:19 AM

tasdevil1

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engine swap

There should be a sticker on the valve cover. Plus if you say they both have an M stamped into them, thats a good indication. They should phisicly look the same.

Mar 26, 2005 | 08:02 AM

TheWiz427

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From: Woodruff, SC

You'd get more information if you ask this question in the 335 Series- 351M, 400, 351 Cleveland Forum.

Apr 20, 2005 | 09:49 PM

jwmustangman

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The quickest way to tell is look at the valve covers and the back of the block. If the valve covers look the same as your 351m, and the back of the block is real wide between the top two bolt holes, you have either a 351m or 400 on your hands. the only way to know for sure which it is is to check the #s on the block or tear it down and measure the stroke of the crank. I know this because I had a 351m in my 78 F-150 ranger that crapped out on me. I went the the junk yard and bought what was supposed to be a 351m and dropped it in my truck. That was like 2 years ago. I just pulled it out to do the bottom end (preventative maintenence) and only found out when I went to have my crank turned that it was really a 400. I ran it in my truck for 2 years before I actually knew that it was a 400 instead of a 351m. So, to make a short story very long, take it from experience, it will bolt right in no problem. You will probably have to put your motor mounts on it, of course, if it came out of a lincoln, though. Best of luck to ya!

Apr 21, 2005 | 04:14 AM

Rob Cuenin

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From: Palm Bay,Florida

taking the 400 out today no compression in #1 cylinder. got a rebuilt longblock 4oo on its way from power pro 2000. they said 2 to 3 days for shipping but its been 5 days now they say monday the 22nd of april. ill let u know how it goes.