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1972 351 cobra jet carburator

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Matt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matt Quote  Post ReplyReply Direct Link To This Post Topic: 1972 351 cobra jet carburator
    Posted: 31-October-2012 at 9:51AM
What would be the best carburator to use on my 1972 Q-code 351 cobra jet with the stock spread bore manifold with no adapter plate. Thanks. 
Buddy
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sabatona View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sabatona Quote  Post ReplyReply Direct Link To This Post Posted: 31-October-2012 at 10:45AM
I replaced the holley that came with my 73 CJ with a 4300D spreadbore carb. I found one for sale on e bay that had been completely cleaned and rebuilt. Not concourse, but its really close.
Carb works fine also other than the standard hesitation during acceleration that all 4300D's have.
Site for the guy I bought it from is www.oldcrabs.com.
Hope this helps.
73 GTS 351 4V Q Code
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Post Options Post Options   Thanks (0) Thanks(0)   Quote unlovedford Quote  Post ReplyReply Direct Link To This Post Posted: 31-October-2012 at 12:29PM
www.oldcrabs.com

NOW that is funny!!!!
Joe
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Post Options Post Options   Thanks (0) Thanks(0)   Quote legend onirot Quote  Post ReplyReply Direct Link To This Post Posted: 31-October-2012 at 1:33PM
yeah.  i thought he had typed it in wrong and it shoulda been oldcarbs.com, i clicked the link halfway thinking it would take me to some porn site... but it was the correct site...Unhappy 
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malcolm
1973 gran torino sport (formal)... "Stacy Lynn"
1972 gran torino (formal)... "Mackenzie"
1973 gran torino sport (sportroof)... "Leela"
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sabatona View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sabatona Quote  Post ReplyReply Direct Link To This Post Posted: 01-November-2012 at 12:33PM
no funny stuff, just the facts. I will probably send the carb out to pony carburators in Az. www.ponycarburators.com they do a mod to these carbs that fixes the dead spot and a few other things. Its fine for now, just cannot jump on it or it hesitates big time.
Had Pony carbs rebuild the carb on my mothers 67 mustang fastback, and it is 100% perfect both in appearance, and how it runs. Practically runs like an EFI car....
73 GTS 351 4V Q Code
Blue Glow/Blue Int
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unlovedford View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote unlovedford Quote  Post ReplyReply Direct Link To This Post Posted: 01-November-2012 at 12:37PM
That is impressive. My '76 carb was like that, but is now junk from sitting so long. Never had another that good since.
Joe
1972 GTSquire Wagon
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sabatona Quote  Post ReplyReply Direct Link To This Post Posted: 01-November-2012 at 12:44PM
73 GTS 351 4V Q Code
Blue Glow/Blue Int
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mcford View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mcford Quote  Post ReplyReply Direct Link To This Post Posted: 05-November-2012 at 11:46AM
Originally posted by sabatona sabatona wrote:

no funny stuff, just the facts. I will probably send the carb out to pony carburators in Az. www.ponycarburators.com they do a mod to these carbs that fixes the dead spot and a few other things. Its fine for now, just cannot jump on it or it hesitates big time.
Had Pony carbs rebuild the carb on my mothers 67 mustang fastback, and it is 100% perfect both in appearance, and how it runs. Practically runs like an EFI car....

you got luckier than alot of folks.  Over the years a i have heard very little good about pony carbs and their pricing is way high.
Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 06-November-2012 at 2:21PM
is there a simple way to tell a 351c from a 351m.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote unlovedford Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 2:08AM
Step on the accelerator pedal.
Joe
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 2:24AM
Ok what does that prove.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote unlovedford Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 4:02AM
Just joking.


Most Ford enthusiasts are well aware of the 351 Cleveland engine, and its short, but well known, history. However there is confusion regarding the 351M and 400 engines.

The 351M and 400 engines were derived from the 351C, and are all considered part of Fords "335 series" of engines.

The 400 engine was developed in in 1970 in response to the increase in pollution control measures placed on auto manufacturers. Big and heavy cars were still the fad, but the traditional Ford powerplants, such as the 390 and 460, could not meet the new emissions requirements.

Ford needed a "go between" engine, something with more displacement than the Cleveland, but not as much as the 385 series motors. Ford also needed an engine that could be used in trucks and large vehicles, and utilize their existing heavy-duty transmissions. The 351C would not work due to its small-block "Windsor" bellhousing bolt pattern.

Engineers took the Cleveland motor as a starting point and modified it in several ways:
400 cid.
Bellhousing pattern same as 429/460 (to allow use of already existing heavy-duty transmissions.
Main journal diameter increased by 0.25" to 3.00" for greater bearing surface area (incidentally, same as a 351W)
Crank stroke increased from 3.50" to 4.00" to gain 50 cid.
Deck height increased from 9.206" to 10.297" accommodate larger stroke
New intake manifold for wider deck.
Heads are identical in design to 351-2V, but have larger chambers to reduce compression, may also have air injection ports.
Different harmonic balancer and flexplate than 351C

351M
Same block as 400, but crank is back to 3.50" stroke.
Pistons have thicker compression height to maintain compression a 8.2:1 in the tall deck.
Different harmonic balancer than 400
Production of the 400 and 351M engines ceased in the early 80's, as oil prices began to sky rocket and federal EPA regulations became stricter. Ford turned to its Windsor series engines as the primary V8 options for passenger cars and trucks.

Hope this helps.
Joe
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1972 Torino Wagon
1976 Torino       
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1972 Torino 460
1989 BroncoII/Jeeps/Titanimous
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 4:26AM
short answer: look at the thermostat housing
 
the 351C T-stat housing will be mounted flush flat to the top of the timing case of the block
 
the 351M/400 T-stat housing will be mounted up on about a 1" tall riser on the timing case housing
 
Windsor T-stat housing is mounted facing forward to the intake manifold
 
this pic shows the M block T-stat riser. also, most but not all have the standing rib on the other side of the distributor hole. no Clevelands have the standing rib
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote unlovedford Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 6:57AM
There 'ya go!
Joe
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1972 Torino 460
1989 BroncoII/Jeeps/Titanimous
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 7:25AM
ok. that ltd2 was most likely a 351m I believe ford dropped the 400 in 78 or other way around.the car had cobra jet stickers on fenders and a cobra jet emblem on the dash. It had al.valve covers with ford on them and a cobra jet air.I am pretty sure the t stat was level with the intake.Guy selling it said owner said it was a 351c.not thank for the info.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 7:39AM
they both have the T-stat level with the intake, see how the riser is the same height as the intake end seal rail? the 351C intake is about 1" lower than the M/400 intake, there's just no riser needed to get it there because the deck height of the 351C is about 1" lower than the 351M/400
 
here's a 351C
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 7:45AM
another sure tell:
 
the 351C uses 2 bolts to hold the motor mount to the block
 
the 351M/400 uses 3 bolts to hold the mount to the block
 
this pic shows both the 3 bolt mount pattern AND the 2 bolt mount positions(not drilled)
 
 
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 7:56AM
the width of the intake manifold end seals is also different between the 351C vs 351M/400
or the straight across distance between the cylinder head deck surfaces on the flat rails
 
the 351C valley width measures 6-31/32", or just about 7"
 
the 351M/400 valley width measures 8-17/32", or just about 8 1/2"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 12:07PM
I should have asked these questions when I was in Dearborn but I was to bumned out over the condition of the car.Now back in ny I am curious.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robbdtme Quote  Post ReplyReply Direct Link To This Post Posted: 07-November-2012 at 2:55PM
I always looked at the bell housing first. C small block pattern M Big Block pattern. That's why we mentioned saving those small block C6 trannys you had,Bolt right on a C
Johnny cash Special 74-75-76 freak. 77 XR7. 78 LTD II sport looks pretty but poop 302 in it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 08-November-2012 at 4:01AM
bell is not a sure thing, uneducated could be looking at an FMX block and not know it
 
small bell trans is a Cleveland... right?
 
imagine passing up an FMX block because you thought it was a Cleveland Pinch 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote unlovedford Quote  Post ReplyReply Direct Link To This Post Posted: 08-November-2012 at 4:27AM
Yikes, that would be a Homer Simpson "Dooh" moment. Kind of if I had junked the SBF C6 I considered doing.
Joe
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1972 Torino Wagon
1976 Torino       
1968 Cougar XR7-First batch
1972 Torino 460
1989 BroncoII/Jeeps/Titanimous
Popeye and Brutus (Rams)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stanman Quote  Post ReplyReply Direct Link To This Post Posted: 08-November-2012 at 7:38AM
OK, I'll bite....what's an FMX block?....Confused
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 08-November-2012 at 10:39AM
http://351cleveland.wetpaint.com/page/Block+400+FMX
 
the FMX block also has unfinished 302/5.0/351W/351C 2 bolt mount bosses on the (US) passenger side, the oil filter side has only 1 unfinished 2 bolt mount bosses, and the regular 3 bolt mount bosses for 351M/400
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 15-December-2012 at 6:08AM
Is it common for the elect choke to be wired to the coil.Also two green one red wire going to tach side of coil greens connected red not tack don't work.
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