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                      INTRODUCTION              
                                             
  The following listing contains the model carburetors which are contained within this manual. Part
numbers and other carburetor information applicable to each vehicle may be found in the Holley Parts
Catalog.
                                             
          Model                     Applications        
                                             
23000 (Dual)                     8 cylinder passenger cars.          
                                             
2300G (Dual, governor)                 6 and 8 cylinder trucks with governor.      
                                             
4150C (4 bore)                   8 cylinder passenger cars.          
                                             
4150G (4 bore, governor)               6 and 8 cylinder trucks with governor.      
                                             
4150MG (4 bore, mechanical governor)         8 cylinder trucks with mechanical governor.    
                                             
4160C (4 bore)                   8 cylinder passenger cars.          
                                             
4160 (4 bore with mechanical secondarys)       8 cylinder passenger cars.          
                                             
                        NOTE                  
                                             
    Part Numbers and other carburetor information applicable to each vehicle, may be found in the
Holley Carburetor Parts Catalog.		  
                                             
                      DESCRIPTION                
                                             
1.   PRIMARY FUEL SYSTEMS             2. SECONDARY FUEL SYSTEXB (Four Bore
Only)
                           
The following systems are the same for two
and four bore carburetors and will be explained in
detail only in the primary explanation.		                      
    The secondary side of the four bore models
includes the following systems:
                     
                            A. FUEL INLET - Operates the same as on
the primary side receiving fuel through a connect
ing tube at the primary fuel inlet.
A. FUEL INLET SYSTEM - Controls and
supplies the fuel to be used by the other systems.		    
                                             
                            B. IDLE SYSTEM - Regulates fuel flow at
idle and low speeds.
B. IDLE SYSTEM - Provides a rich mixture
for smooth idle and low speed performance.		    
                     
                                             
                            C. MAIN METERING - Provides the second
ary side with the correct mixture for heavy load
conditions.
C. ACCELERATING PUMP SYSTEM - Pro
vides additional fuel during acceleration.		    
                           
                                             
D. MAIN METERING SYSTEM - Provides an
economical mixture for normal cruising condi
tions.		     D. POWER ENRICHMENT -On some models
a power valve may be incorporated in the second
ary metering body.
                                             
E. POWER ENRICHMENT SYSTEM - Pro
vides richer mixture when high power output is
desired.		     3. ACCESSORIES            
                     
        A. SECONDARY THROTTLE OPERATION -
                     
                                             
                            (1) Vacuum -When engine speed increas
es to a point where additional breathing capacity
is needed, the vacuum controlled secondary
throttle plates open automatically.
F. CHOKE SYSTEM - Provides a means of
temporarily enriching the fuel mixture to aid in
the starting and operation of a cold engine.		    
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