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351W identification
#1
I have a 1973 fastback that I'm building. An old lady had a 351 motor out of her deceased husbands mustang II that he rebuilt. She said I could have it for 200 bucks so I bought  it for my 73. I'm trying to figure out what year it is and the block casting is E4AE which means it's a 84 I believe? Now I'm trying to figure out the heads on this thing. I cannot find any casting on the outside of the heads but on the inside it has 6B13 and 6E13 on the other. Are these 1966 heads? Is there any benefits on putting 1966 heads on on a 84 351w? How do I find out what kindve heads they are, because that's the only casting numbers I can find.[Image: 15646881090837976029776968763434.jpg][Image: 15646881496573205273766520057443.jpg][Image: 15646882141554233091627121263210.jpg]
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#2
That is the date code on the heads. Here is link to a good source to look them up. http://www.mustangtek.com/heads/Heads.html
There should be other info that is under the valve covers usually and some other areas also.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#3
I am not up on all the differences and depending on what transmission you have that might not work. There is no place for a clutch pivot on the 84 was cable clutch and the balance and firing orders were also changed. Be careful of what parts you mix and match do some research first.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#4
They didn't start making 351Ws until 1969, so your heads will be 1976, as is the block. E4AE-DA blocks were built from 1975 to 1978. I believe you'll need to pull the intake manifold to find the casting number.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#5
I guess its stamped under the head ?
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#6
(08-01-2019, 03:33 PM)Don C Wrote: They didn't start making 351Ws until 1969, so your heads will be 1976, as is the block. E4AE-DA blocks were built from 1975 to 1978. I believe you'll need to pull the intake manifold to find the casting number.
Okay good, I was thinking I had to pull the heads. The date code I pictured under the valve cover decoded as 1966 feburary 13? What's that date for if the head are 1976? I'm confused
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#7
Me too, I messed up on my reply above, your block has a 1984 casting mumber and was built in 1986. Your heads are also likely 1986. The 6 in the date code is just the year, not the decade. You generally rely on the casting number for the decade, which, because your casting number begins with "E", is 1980. Right below the block casting number is the block date code, which begins with a 6. Because they didn't begin 351W production until 1969 your heads would have to be 1976 or 1986. 1976 would be more desirable because they have smaller chambers and larger ports. Other than that the best 351W heads are the GT40 and GT40P heads from the '90s.

With the intake manifold off you should be able to see the head casting number under the edge of the head, from inside the valley, use a mirror or camera. You can see where they are in the link that David provided.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#8
I'd leave it as-is and run it. If it's been rebuilt, it should do just fine. 86 351W could be from a truck or Crown Vic special service vehicle. Neither are rockets, but provide good, reliable, torquey power.


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#9
(08-02-2019, 11:49 AM)Hemikiller Wrote: I'd leave it as-is and run it. If it's been rebuilt, it should do just fine. 86 351W could be from a truck or Crown Vic special service vehicle. Neither are rockets, but provide good, reliable, torquey power.

I will for now! I was worried because someone told me an 86 351w with stock heads make less hp than a 302 so I was disappointed on my purchase
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#10
Whoever told you that was probably comparing the SAE gross horsepower of pre-1972 302s to the SAE net horsepower of the 1986 351W. In 1986 the 302 and 351W used the same cylinder head and the 351W had more horsepower and significantly more torque.

Ford changed from SAE gross horsepower rating to SAE net horsepower rating in 1972. This made the 1972, and later, engines appear to have much less horsepower. While actual horsepower was down, due to increasing emissions standards, it was only down slightly, not nearly as much as the change in rating standard made it seem.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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