400 Mercury??
Junior User
Joined: Dec 2003
Posts: 54
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From: Athens, TX
Yes, From what I know. 351M & 400 are the same block, just different bores(?) and or strokes(?)
What is the Mercury engine out of, or do you know? year? I have seen some people call an engine a 400 when actually it was an old 410. But for no other reason than that, they weren't sure of the cu. in. and engine family.
What is the Mercury engine out of, or do you know? year? I have seen some people call an engine a 400 when actually it was an old 410. But for no other reason than that, they weren't sure of the cu. in. and engine family.
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New User
Joined: Nov 2003
Posts: 8
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From: Wherever I May Roam
It is out of a Mercury Monterey. The year, I don't know. The engine looks just like a 351M/400 Ford. It says 400-2V on the Air Cleaner housing. I know nothing about the car except that it took a major impact on the passenger side. My mom had a '73 Mercury Montego with a 400. I know the firing order is different than the Ford. My dad tuned it up one time and tried to put the plug wires back on like a 400 Ford and it wouldn't hardly run, looked up in the Chilton, saw the Mercury section, fixed the wires, problem solved. Thanks for all your help.
Posting Guru
Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
Any 351M/400 engine will bolt in place of any other 351M/400 engine, except for a somewhat rare 1973 400 variant that used the small-block (302/351W/351C) bell housing pattern. Other than its bell housing mount, even that 400 will bolt in place of any other 400 (same engine block mounts).
All 351M/400 engines have the same firing order (which is the same as the 351C firing order). It's possible your dad tried to use the 302/351W firing order, or the 460 firing order, which is different.
The only functional components that are different in 351M and 400 engines are the crankshafts and pistons. Both engines use the same connecting rods (with a taller piston in the 351M to make up the stroke difference).
Check this page for more general info about the 351M/400 engines:
http://home.earthlink.net/~bubbaf250/
Check this page for a list of Ford and Lincoln/Mercury vehicles that were equipped with the 351M/400 engines:
http://home.earthlink.net/~bubbaf250...history10.html
All 351M/400 engines have the same firing order (which is the same as the 351C firing order). It's possible your dad tried to use the 302/351W firing order, or the 460 firing order, which is different.
The only functional components that are different in 351M and 400 engines are the crankshafts and pistons. Both engines use the same connecting rods (with a taller piston in the 351M to make up the stroke difference).
Check this page for more general info about the 351M/400 engines:
http://home.earthlink.net/~bubbaf250/
Check this page for a list of Ford and Lincoln/Mercury vehicles that were equipped with the 351M/400 engines:
http://home.earthlink.net/~bubbaf250...history10.html
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Elder User
Joined: Sep 2003
Posts: 908
Likes: 4
Why in the world would the firing order be different between a 400 Ford and Mercury? By '73, the only difference between the 2 makes were cosmetic.
Far more likely your mom had some other engine and someone stuck a 400 air cleaner on it.
Far more likely your mom had some other engine and someone stuck a 400 air cleaner on it.
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Joined: May 2003
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From: Benbrook, Texas
There were 400's installed in some Mercurys, being a rookie at this I learned it the hard way! I pulled a 400 out of a junk 74 Cougar (foolishly believing it was a Cleveland) for my rebuild. Nowhere on the motor did the word Mercury appear, in fact it had the Power by Ford stock valvecovers. It was bolted to a big block pattern C-6, just like the one behind the 351M in my 78 F-150.
The firing order question seems hard to believe...
Good luck on the Bronco!
Robert Booth
'78 Ford F-150 Explorer
Arlington, TX
The firing order question seems hard to believe...
Good luck on the Bronco!
Robert Booth
'78 Ford F-150 Explorer
Arlington, TX
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Snowking
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Oct 12, 2007 08:19 AM
