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How to tell 351W exhaust manifolds from 302?
#1
Hi guys.
My turn to pick your brains. :-)

As the title says I´d like to know how I can tell if stock exhaust manifolds are really 351W ones. I know the encoded data tells the year and the car that the part was originally designed for and the number tells me what department of the firm the part was made by ( engine, interior etc).

But is there anything that identifies the part as such? A code or anything that says "Manifold for a 351W"?

The story behind it is that I can get manifolds from a 1970 Ford LTD. The owner thinks it has the original manifolds but we all know that those might have been replaced in the past. Now, I have my old 302 ones here (one is dated "D4", so much for "original"!), so I don´t wanna risk buying the same ones......
Thanks!

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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#2
This may help. http://mustangtek.com/exhaust/Exhaust.html Chuck

Even if it is a 351W manifold from a LTD it may not fit because it is from a different chassis. I'll see if I can find some more information.
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#3
Mike,

I would suggest that the easiest way to tell the difference is to measure the ports. The 302 size will be 1.82" X .90" while the 351W will be 1.82" X 1.02".

If you know it is a small block intake and the width of the port is less than 1", it is probably for a 289/302. If the width is a little over an inch, you probably have a 351W.

Hope this helps.

BT

Do the RIGHT thing.
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#4
Hey Mike,
Got this info from Fordication:
Windsor engine characteristics
Thermostat housing bolted to the front of the intake manifold

All 289/302/351's have intake bolts 90 degrees to the ground

289/302/351's have evenly spaced exhausts aimed 90 degrees from length of head

5/8" (18mm) spark plugs

The 351W and 302 are very different:

The 351W has a taller deck height than the 302. (a 302 will have the intake almost flush with the base of the distributor... where it goes into the block..... a 351w will have about 1/2 inch lip there where the intake meets the block.)

Since the deck height is taller the intake manifold is wider on the 351w than on the 302.

The 351W uses a larger main journal than the 302. there are 2 physical ways of telling a 302 vs. a 351w. Also, in between the frost plugs on a 351W there will be what appears to be a triangle or diamond (the way I was told) indented cast into the block...a 302 doesn't have those.

a 351W is wider between the heads compared to a 302 (the intake manifold is wider by about 1-1/2") and 351 pistons have a different pin height. You can use 302 pistons in a 351 if you stroke it to a 393

quick ID tip: The lower thermostat housing bolt on the 302 will be below the top of the water pump and you won't be able to put a socket on it. On the 351W you can remove the bolt with a socket.

[Image: 14t1lyd.gif]

DJ
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#5
BT, I thought he was talking about exhaust manifolds, maybe not.

Luxstang, Why do you want to use stock manifolds on your Ford Racing crate engine? Also, I can not find any info on 70 LTD 351W manifold casting numbers. If someone has a master parts list they may be able to help.

Chuck
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#6
c9zx;44482 Wrote:BT, I thought he was talking about exhaust manifolds, maybe not.

Luxstang, Why do you want to use stock manifolds on your Ford Racing crate engine? Also, I can not find any info on 70 LTD 351W manifold casting numbers. If someone has a master parts list they may be able to help.

Chuck
Duh!!
Reread the original post and as my Daughter would say, "My Bad!" he does say "Exhaust" in his post.

BT


Do the RIGHT thing.
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#7
Hi Guys,
thanks for your replies.
However I had to edit the subject and the text in the post.
I really meant exhaust manifolds.
As English is not my native language, I forgot that in fact a manifold could be both intake and exhaust. My bad..Blush
Sorry!

As for the reason I thought about having stock manifolds on the car: I need the ground clearance. The long tube headers I´ve had on the car for 8 years now end underneath the floorboards and scrape the ground on speedbumps and driveways. I got only barely 2 inches between the headers and the ground. Not good!
Now I got a stock replacement exhaust for a 351 C Mach1 and I got some shorty headers but I thought, while I´m at it, I might as well go back to factory look.

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

  Reply
#8
LOL! Now those are interchangeable. For the 1970 302 and 351w this should be the same part numbers: D0OE-9431-D and D0OE-9430-D
Big Grin
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#9
Not sure if this helps but I thought I would post it again if anybody needs it.

Ford part numbers.

http://www.fordmustangparts.com/inv1213b.htm

My garage http://www.7173mustangs.com/forum-garage...rxt_uid=40

73 mach 1 351c 4v cc ported, torker2, 750 edelbrock,C6.
73 fastback 351c 2v,performer intake,600 edelbrock,fmx, 325 trac-lok.
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#10
luxstang;44487 Wrote:Hi Guys,
thanks for your replies.
However I had to edit the subject and the text in the post.
I really meant exhaust manifolds.
As English is not my native language, I forgot that in fact a manifold could be both intake and exhaust. My bad..Blush
Sorry!

As for the reason I thought about having stock manifolds on the car: I need the ground clearance. The long tube headers I´ve had on the car for 8 years now end underneath the floorboards and scrape the ground on speedbumps and driveways. I got only barely 2 inches between the headers and the ground. Not good!
Now I got a stock replacement exhaust for a 351 C Mach1 and I got some shorty headers but I thought, while I´m at it, I might as well go back to factory look.
If the shorty headers solve the clearance problem I'd leave them on. However it is your car. Do what pleases you. Viel Gluck, Chuck
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