Technical Stromberg differences?

My Stromberg 97 collection grew recently and I noticed some big differences in the bases. Anyone know why these bases are different? Are the smaller, ”V” shaped base a generic brand or specific to a vehicle?

also I noticed a fuel port in the base above the*****eries that my other bases don’t have.

I can’t find any info online, anyone know what I got? Thanks

 

The "V" base that you have with nozzles inside is for the improved idle circuit.. the carburetor body will have notches in the front edge of the Venturi to clear the nozzles. If you mix and match the bodies you are likely to have idle problems. Contact Max Musgrove, he is the guru for Stromberg carburetors, and can answer your questions. madmax1946@comcast.net

 

A note from Max on those bases I received a while back explains this. I have been messing around with 4 on my Olds. It has been going well and I am now switching to the older series 97's without the nozzles.

The 3rd (upper nozzle) squirters in the later EE-1 V shaped base were thought to improve off-idle response.
The idle airbleeds – in the little channel adjacent to the idle jets were reduced to .0550” from the .1040” size in the older 97’s.
Significantly smaller than the earlier 97’s, to compensate for the airflow signal created by the 3rd nozzles.
The nozzles and notched venturis showed up in some South Bend 97’s and all Elmira 97’s with the V shaped base.
The trouble is, so many of these things were mixed and matched over the years, it’s hard to say what you might have.
At best, if everything’s matching, you’ll more than likely notice some stumbling on a multi carb rig.
You might consider looking for four matching V bases without the 3rd nozzle and drilling the airbleeds to .1040” (#37 drill) for smoother operation.