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Author
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Topic: 351M/400 heads
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Kellxr7
Gearhead Posts: 643
From: Canada
Registered: Mar 2003
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posted 02-22-2004 11:29 AM
   
They are similar to Cleveland style heads right? How to they flow in comparisson? Do they also have the canted valves? Basically what I am wondering is if these were modified to put on a Windsor how well would they perform? Just an Idea because my dad has an 81 F100 with a tired 351M.[This message has been edited by Kellxr7 (edited 02-22-2004).]
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 02-22-2004 02:06 PM
They are basically the same head, except the exhuast port is really bad on the "m" head. The exhuast port isnt good on a standard 2v cleveland head, and it's even worse on the smog (M/400) heads. With all the good aftermarket heads available for a windsor, unless you want to spend a lot of money doing it, I wouldn't put C heads on a windsor.
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Daniel Jones
Gearhead Posts: 813
From: St. Louis, MO
Registered: Aug 99
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posted 02-23-2004 05:42 PM
> They are basically the same head, except the exhuast port is really bad on
> the "m" head. I completely agree with Kid on this. Most of the 2V type heads out there
are really 351M/400 and don't have a good exhaust port. A real 351C-2V
has a better port. > The exhuast port isnt good on a standard 2v cleveland head, and it's
> even worse on the smog (M/400) heads. What don't you like about the 351C-2V exhaust port? On a flow bench,
a 2V flowed within 10 CFM of a 4V port with higher velocity. Also,
the port opening allows a 1 3/4" primary which may be better than
the 4V's 1 7/8" primary in milder applications. The intake is a
completely different story. The 2V was down 90 CFM to the 4V. > With all the good aftermarket heads available for a windsor, unless you
> want to spend a lot of money doing it, I wouldn't put C heads on a windsor. and since it already has a 351M, why not just rebuild it to a 400.
Cheaper than building a 351W and switching over the transmission
and other bits. Dan Jones
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rustang@home
Journeyman Posts: 94
From: Clarion, PA
Registered: Jan 2004
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posted 02-23-2004 11:03 PM
I keep hoping somebody on here builds a 400M with 4V close chambered heads  Put a nice solid lifter cam in it, and a cleveland intake (requires spacers but they're available) and you'd have a serious runnin' cheap motor!  ------------------
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mtkawboy
Journeyman Posts: 36
From: Billings Mt
Registered: Dec 2003
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posted 02-24-2004 12:31 PM
http://www.projectbronco.com/Technical_Articles/351m400_performance_build_up.htm Check this site out. I built my 351 M into a 400 25 years ago with block decked, balanced,milled heads, mild cam, Edelbrock intake, 600 Holley & duals for my F250 4X4. Ran good but not for the money I spent doing it
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mtkawboy
Journeyman Posts: 36
From: Billings Mt
Registered: Dec 2003
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posted 02-25-2004 06:01 PM
http://www.off-road.com/ford/flashback/400_power.html Heres another one with head flow numbers
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rustang@home
Journeyman Posts: 94
From: Clarion, PA
Registered: Jan 2004
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posted 02-25-2004 09:12 PM
this is a subliminal message.....
4V heads...4V heads....try the 4V heads....
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