204 East 15th Street
Eldon, Missouri 65026
Zenith code letter meaning in carburetor type nomenclature
The following is (with permission) from a factory Zenith breakdown of this subject:
A designates a carburetor where the throttle shaft is parallel to the air shutter shaft (with normal air intake).
B designates a carburetor where the throttle shaft is at right angles to the air shutter shaft (with normal air intake).
BB same as above but with fly opening opposite of above (B).
C vacuum pump, NO power jet.
DA duplex carburetor with on throttle shaft.
DB duplex carburetor with two parallel throttle shafts.
E elbow air intake ( for downdraft, horizontal and updraft carburetors, when the angle of the air intake differs from that of the standard of the series)
F governor connection, opposite side from bowl or on left side.
G a carburetor using natural gas or a combination of gasoline and natural gas for fuel
GM special 30 series to General Motors
I special for International Harvester, Inc.
J back-suction economizer
L large bowl ( model 267 carburetors)
LP liquid petroleum gas carburetor
M2 - marine carburetor with screws, brackets, levers, and shafts in brass.
M3 marine carburetor with brass bowl and iron barrel
M4 marine carburetor, all brass
N special for Novi governors
O offset throttle shaft (only in case it differs from the standard).
P pump (14 and 16 models)
R governor connections, same side as bowl or on right side
S straight thru for updraft carburetors
T balanced or sealed bowl vent
U universal replacement carburetor special flange c.c
V vacuum operated power jet if the standard of the series has mechanical pump or no pump
W vacuum pump AND power jet
X oversize flange and/or bolt location
Y undersize flange and/or bolt location
The following for letters FOLLOWING the carburetor size:
C automatic choke
G gas valve attachment for LPG
R Facet regulator or governor
RP Pierce governor
RZ Mechanovac governor
S special flange
SD LP starting device