View Full Version : Intake Numbers and cfm

Alexander Feiman
07-11-2011, 02:25 PM
What are the casting numbers for the intake manifolds? I know the port sizes are different but are the casting numbers different. I've searched web but can't find an answer. Also were the 2brl backdraft carbs different cfm rated, if so how do I identify differences? Thanks ahead for any replies

07-11-2011, 02:32 PM
To identify the differences between a back facing Carb. top and a down draft type, you would look up the Jet sizes in the Fuel Section of the Studebaker Chassis Parts Catalog for each year. Or compare the Stromberg WW 6-XXX Numbers in the Cat. vs on your Carbs.

If you have both types, just measure the throttle throats, '51-'54 232's are NOT the same as '55-'58 259/289 backdrafts or '59-'64 Down Drafts.

Basically, 2 Barrel Manifolds are either the High Rise type '51-'58 used with a backdraft carb. and a remote air cleaner, or the Low Rise type '59-'64 used with a downdraft and Top of Carb. mounted Air Cleaner. These are the ones with the 4 Barrel "shape" cast in, to be machined as a 2 or 4 Brl. and can be re-machined from 2 to 4.

All port OPENING sizes are the same, as the same Intake Gaskets are used 1951 all the way to 1964 except 1964 R3/R4, now what is INSIDE of those intake runners, I have no idea!

No CFM's were ever given, you could use the formula for the cubic inch engine size vs Carb. size needed and come pretty close.

There are quite a few Casting Numbers, depending on the Choke Heater type, Coil Mounting screw holes or not etc. etc. I would not worry about those, that is why I described how to tell the diff.

07-11-2011, 03:21 PM
Hi, Alexander,

Suggest you spell out what you are trying to accomplish. Fer sure, someone here has probably done something similar and can point the way to the parts combination you need.

jack vines

Mike Van Veghten
07-11-2011, 04:50 PM
Like Jack says, what's your goal ?

The basic port sizes are pretty much...the same. Cept for as Rich says the R3/R4 manifolds.
The rest from 53 (I believe) up are the same (within standard tolerances). Two barrel, four barrel, no matter.

Carburetor wise...no idea.


07-11-2011, 06:35 PM
I thought that 51-54 232's port sizes were smaller. Heads were changed in 55 and were the same(port sizes) after that.

07-11-2011, 11:56 PM
Hey Bez, It's the exhaust ports on the 232's that are tiny. I ran a 232 in my Lark with a WCFB and intake. It did pretty good. Ran a little rich but not bad. Even pulled a heavy trailer 300 miles.


07-12-2011, 04:55 AM
232 intake ports were smaller. About the same size jump on late V8 to 232 as R3 to R1.