Thanks Ted. There is a definate difference but to me its not enough that you would ever be able to tell in driving the car. Would probably show up on the quarter mile times but again i'm thinking not much. Driver could make more difference than that. I would still got for the stock .57. Not enough difference between the stock '56 to worry abour. The aftermarket manifolds would be an improvement though. I port matched my '57 to the heads but no idea how much if any help it was.

Looks like the two 56 castings are the 2 different ones. Casting # on the top of one and the bottom of the other. The "8" shaped one also is flat where the carbs bolt and the other has indent/open areas between the studs unless one has be trimmed a bit. The 56 did not need an indented valley cover either as I understand it like the stock 57. Did any aftermarket dual quads need one?  I love reading and learning about these early factory and aftermarket performance parts.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Both styles of the ’56 Ford 2X4 EDB-C intakes I’ve had in my hands required a ’depressed’ valley cover to allow the intake to bolt in place without any valley cover clearance issues.  On the flip side of this, the 1956 Mercury 2X4 intake does not require a special cover but that intake looks to have come out of the same basic molds as the Edelbrock FM255 intake.  The Ford intakes were cast by Schmeller Aluminum and are a completely different design than the Edelbrock intakes.  Even the carb spacing is different between the Ford and Mercury 2X4 intakes.  To date, I haven't come across any aftermarket or non-Ford dual quad Y intakes that required an indented valley cover to facilitate their installations on the engine.

Lorena, Texas (South of Waco)

Here’s an updated list with Cliff Murray’s manifolds added to the list. It's now 53 manifolds not counting the easyissy manifold that the date was unclear on.  That one is not on the list yet.  Ebay manifolds do come up but if the dates on those manifolds are already on the following list, they are not listed.  If the date is new to the list, they will get listed.   Still missing manifolds cast up during November 1956.
 
10-15-56 (JH)
 
12-5 (JH & RH), 12-6 (RF & Marc), 12-13 (JH), 12-14 (EP & Ted), 12-17 (TD), 12-18 (CM), 12-18 (CM), 12-21 (Ted), 12-28 (JH)
 
1-3 (JH from Ebay, CM), 1-9 (DK & NoShortcuts), 1-11 (RG), 1-16 (CM), 1-18 (JH), 1-22 (Genuinerod & Ted)
 
2-4 (JH), 2-7 (JH from Ebay & SL444), 2-18 (JH & SL444), 2-28 (EP & JH),
 
3-6 (JH), 3-7 (JH), 3-8 (JH), 3-13 (EP & JH), 3-26 (Mike), 3-29 (EP & JH & Ted)
 
4-3 (JH), 4-11 (SL444)
 
5-8 (JH from Ebay), 5-10 (EBay, CM), 5-28-57 (fakirone)
 
6-3 (JH), 6-5-57 (Ted), 6-6-57 (Flatrod & JH), 6-10 (JH), 6-11 (Robs36 &Robs36)
 
No date (CL & EBay & SL44) 

Lorena, Texas (South of Waco)

I recently acquired an ECG-D with 1-3


Lawrenceville, GA

Charlie’s ‘1-3’ manifold has been added to the list.  There’s fifty five manifolds now listed.  That’s 1% of the ECG-D manifold production.  There were approximately 5500 of those manifolds cast and assuming about 255 casting days in a 12 month production year, that would mean about 21-22 manifolds cast each day not including defects.  From the looks of the dates that have been listed, there was only a nine month production window so there would have been a larger number of manifolds produced daily than what I calculated above.  There are still no November 1956 manifolds listed yet.

10-15-56 (JH)
 
12-5 (JH & RH), 12-6 (RF & Marc), 12-13 (JH), 12-14 (EP & Ted), 12-17 (TD), 12-18 (CM), 12-18 (Cliff), 12-21 (Ted), 12-28 (JH)
 
1-3 (JH from Ebay & CM & ChMcC), 1-9 (DK & NoShortcuts), 1-11 (RG), 1-16 (CM), 1-18 (JH), 1-22 (Genuinerod & Ted)
 
2-4 (JH), 2-7 (JH from Ebay & SL444), 2-18 (JH & SL444), 2-28 (EP & JH),
 
3-6 (JH), 3-7 (JH), 3-8 (JH), 3-13 (EP & JH), 3-26 (Mike), 3-29 (EP & JH & Ted)
 
4-3 (JH), 4-11 (SL444)
 
5-8 (JH from Ebay), 5-10 (EBay & CM), 5-28-57 (fakirone)
 
6-3 (JH), 6-5-57 (Ted), 6-6-57 (Flatrod & JH), 6-10 (JH), 6-11 (Robs36 & Robs36)

Illegible date (easyissy)
 
No date (CL & EBay & SL44) 

Lorena, Texas (South of Waco)

On the Facebook group, a guy says he has an ECG with 1-15.

On eBay is one from Cliff Murray (CM?) Looks like 1-3 but could be a duplicate.  https://www.ebay.com/itm/264399248458?fbclid=IwAR1jrIJbJ6vX1Ey3cx1asg83no299_QDyuIPUmWmJeYHGfElem2Hd2x4oKc


Lawrenceville, GA

Would like to add
5-14-57
Spotted at Fall Carlise yesterday
Oldmics  (JH)

Also just saw a 4-2 and a  4-9 on ebay on Nov 17th

This is not on the list !
1-23
In Alberta, (don't see this in the classifieds here? not a member?)
https://www.kijiji.ca/v-engines-and-engine-parts/strathcona-county/intake-manifold/1541274521


1936 Ford 3W Coupe : 56 T-Bird 312, 47 Packard 3 speed, 40 juice brakes.
1968 Merc Cyclone FB GT 390, Getting a better front clip!
1977 Ford F-250 Supercab RWD Explorer Long box.
1976 Chev Camaro RS LT
Future rebuild : 1949 Ford F-1

hi ted! i have three intakes! 1 has no date code at all and it doesn't look to be ground off! the other two are- 1-18 and 3-23 they all have the 8 pattern!

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.