The Carburetor Shop LLC

204 East 15th Street

Eldon, Missouri 65026

 

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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