Does anyone happen to know what the change was from the ECZ9425A to the ECZ9425B intake manifold? I know the latter is the more desirable, but not sure what the difference is . . .

Thanks!

 

There may be more differences, but one is the carborator flanges are different. The second matches up with most modern carbs, the first was a square flange that I think only matched up to the Holley carbs of the time.

I am running ECZ9425B with a new Eldebrock carb.

 

The small base -A version will take the Holley 4100, Carter WCFB and Rochester 4G series as is. You can buy an adapter to run a modern base carb.
The runners dont flow the best but for average truck use it is fine.

The -B which came out in 57 flows very well and unless you want bragging rights is almost as good as a Blue Thunder at truck speeds.

Some have got out the grinder and opened up the -A bores and got some impressive flow numbers.

NOW, if you want real bragging rights get an Edelbrock 573 and add three 94's. You cant beat it for eye candy! The 573 is the best flowing, the 553 is OK; stay far away from an Offenhouser.

 

Thanks - that's helpful. Was the -A only made in '57?

 

The -A was available 55-6 on the 272, 292 and 312. Another with smaller ports was made for the 54 Merc and its peanut valve heads; not really interchangable on later engines.

 

I have the "A" version on my 56 with the teapot carb. Do the adaptors allow for spread bore or does it have to be the Holley style secondaries?

 

anyone have a suplyer and part numbers for the adaptors? thanks

 

I believe that an adapter to go from spreadbore/QJ to the standard Holley is already available. Then you need another to go down to the small base; Offy carries that one.

OTOH, I wonder how pratical it will be dumping those monster secondaries down into a little ole Y Block?

 

This is very true people need to remember a 292 only flows 292 CFM on a excellent day. A hi performance 292 might flow 500 cfm if built to run at wide open throttle all day. A oversized unit causes nothing but poor throttle responce and poor gas mileage, and many hours of wondering why the exgine runs like crap with the shiney oversized carburetor on there.

 

Dont mean step on Your post, But I have a 292 Y block in My 55' F100 and I have a 2 barrel manifold for it with the part# B9EA-9425-B ..... Will a Holley 2300 500 CFM 2 barrel fit on this manifold?? Also can it be sandblasted and powder coated?? I sure hope so with the gas prices the way they are. Would this be a good set up ? Any feed back would help, Thanks.
Mason.

 

The carb I want to put on is a ford 4100 with 1.16 venturis. It should be less than 600 CFM and is the square bore. I think they used these on the 58/59 FEs.

sj

 

It will bolt on as the original 2300 came out on the 57 at 300cfm. I think 500 cfm in a 2 bbl will be too much; that is primarily a racing carb. Consider an Autolite/Motorcraft off a 60-70's SBF or FE.
Cheap to buy, easy to rebuild, decent performance.

 

Summit racing has them for 13.95 made by trans-dapt

 

wow NOW that's a resurrection

 

What were the problems with the Offy tri power?