351m swap
351m swap
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Senior User
Joined: Feb 2006
Posts: 111
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why not swap it out isint the 351m a bigger engine what is the comparision to the351wi dont know much about the 351m but i have one with 12,000 miles on it with a two wheel drive trans but i m looking for a 4wd trans
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
the 351m is very restricted. gets horrible gas mileage and the power output sucks unless its been heavily gone thru.
stay with the 351w and rebuild it or find a wrecking yard 351w and use your parts. easier, less to change over
stay with the 351w and rebuild it or find a wrecking yard 351w and use your parts. easier, less to change over
Post Fiend
Joined: Jan 2003
Posts: 10,323
Likes: 2
From: Montana Territory
Welcome to FTE! 
There isn't anything wrong with the 351M, but for the amount of work you would have to do, it would probably be easier to rebuild your 351W. As stated above, you need a different transmission or at least a bellhousing.
Good Luck!
There isn't anything wrong with the 351M, but for the amount of work you would have to do, it would probably be easier to rebuild your 351W. As stated above, you need a different transmission or at least a bellhousing.
Good Luck!
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
The 351M is an OK engine, not a good or even great engine, -just OK. The 351M was not really restricted tho unless you count the long rods and tall heavy pistons. It was free breathing but not free revving. The 351W had the same bore and stroke but will turn higher RPM's better even tho it was "restricted" in the head breathing department which resulted in the nickname "Wheezer". Check with the 351W forum for more information on how to improve your existing 351W engine. There are lots of nice things available for that engine. You can swap in a 351M but many changes are required as noted above and many more. Stick with the 351W, it was a "good" engine and with mods can be a "great" engine.
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Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
Originally Posted by onebad40willys
you could swap the 351m heads with the 351w. After u do the proper mod's to the 351m heads
Junior User
Joined: Jan 2001
Posts: 89
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the 351c head's would be better than the 351m & 400 head's. And ford still or did make a aluminium version of it. I think it's for the svo block but i dont have a current performance part's book. I think the 351w require's spacer's to use the 351c/m & 400 and 302 boss intake's. Header fitment could be interesting on a mid-80's ford.
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