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Old 10-20-2004, 10:09 AM
Unwound Unwound is offline
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351M: big block or small block?

I have a 78 F250 with a 351M. Someone wants to pull the engine out and use it in his boat, but it'll only fit if it's a small block. Does anyone know if 351M's are small block or big block? Thanks.
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Old 10-20-2004, 10:18 AM
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Bill Beyer, moderator of the 335 series forum (351C, 351M/400) posted the following in the 335 series engine forum guidelines:

"Avoid speculation on whether the 351M/400 is a "big block" or "small block". These are generic terms which generally apply to Ch*vy motors not our beloved blue oval mills so they really have no place in this group. The 351M/400 has elements relating to both the 385 series and the Windsor series and attempting to categorize them is futile, especially when using monikers which FoMoCo never adopted."

FWIW, the bellhousing bolt pattern on the 351M is the same as the 429/460.
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Old 10-20-2004, 10:18 AM
73Custom 73Custom is offline
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Well said Jason...

His boat must need a 289, 302, 351w or 351c.

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Last edited by 73Custom; 10-20-2004 at 10:21 AM.
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Old 10-20-2004, 10:25 AM
Unwound Unwound is offline
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So, it sounds like the 351M is on the bigger side, and if he's looking for a smaller V8 this one is probably too big? I suppose I could just get in there and actually measure the max height & width.
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Old 10-20-2004, 10:36 AM
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but isnt a clevleand a "big block"
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Old 10-20-2004, 10:58 AM
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I'm assuming that with a boat, the main issue is the bellhousing bolt pattern. The drive system must've been made for a peticular motor. The 'small block' Ford pattern is the same for 289, 302, 351w and 351c - they all have the same bellhousing bolt pattern.

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Old 10-20-2004, 11:26 AM
Unwound Unwound is offline
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I don't think the bolt pattern is the issue. I think his concern was with the actual dimensions of the engine, that it would be too tall & wide.
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Old 10-20-2004, 11:32 AM
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I am by no means an expert but don't you think the 351M would make a really lousy boat motor anyway?
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Old 10-20-2004, 11:46 AM
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I would suggest a nice 302. Folks who swap V8's into old Scouts and such will tell you the little Ford is trimmer, an easier fit than the smallblock Chevy.
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Old 10-20-2004, 12:28 PM
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This is an ENGINE Question not 73-79 truc k question
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Old 10-20-2004, 12:39 PM
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yep. sorry. i have a hard time not thinking of all my questions as 73-79 questions. i'll try to remember that next time.
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Old 10-20-2004, 01:51 PM
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Some engine dimensions: 221thru302: 24"w,29"Ln, 27.5"ht, 460 wt;
351w: 25"w, 29"Ln, 28.5"ht, 525 wt;
351C: 25.5"w,29"Ln, 29"ht, 550 wt;
351M-400: 26"wi, 29"Ln, 29"ht, 575 wt;
332-428: 27"w, 32"Ln, 29"ht, 625 wt.
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Old 10-20-2004, 01:52 PM
Rancheroracer Rancheroracer is offline
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Forgot the other "big block", 429-460: 27"w, 34"Ln, 29"ht, 720 wt
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Old 10-20-2004, 02:53 PM
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thanks Rancheroracer ! that's exactly what i needed.
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Old 10-20-2004, 11:37 PM
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