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
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Intake Numbers and cfm
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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.Last edited by StudeRich; 07-11-2011, 12:00 PM.StudeRich
Second Generation Stude Driver,
Proud '54 Starliner Owner
SDC Member Since 1967
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