Carburadores 71-73 Mustangs

CARBURETORS
The 429 CJ used the Rochestor Quadrajet carburetor and the 429 SCJ used a Holley 780. 
Additional details are described below.
(Note: Click thumbnails to enlarge pictures.)
Holley780 Carburetor used on the 429 SCJ
Note that the automatic trans version (D1ZF-9510-XA) used the solenoid and the 4 speed version (D1ZF-9510-YA) used a dashpot. |

        
        D1ZF-9510-XAUsed on 71 429 SCJ Mustang with C6 transmission. The auto trans used a solenoid as shown below.  
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D1ZF-9510-YA Used on the 71 429 SCJ Mustang with 4 speed transmission. The 4 speeduses a Dashpot (shown below). Bracket at center and installed view at right.    
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            Choke Tubes and Stove The two photos at left show the choke tubes used on the 429 SCJ Mustang withthe Holley 780. The choke tubes inserted into the open ends of the choke stove (various views). The "U" shaped portion was installed into the intake manifold where it was exposed to heat from theexhaust gas routed from the heads to the intake manifold. Vacuum from air entering the carburetor drew fresh air into the top choke tube, where it then passed through the heated U shaped stove installedin the manifold, then into the choke housing to heat the choke coil and cause the choke to open. The heated air was then exhausted from the choke housing |
 
Rochestor Carburetor used on the 429 CJClick this link to Dan Davis's Special Write-up: The Rochestor Carb used on the 429 CJ |
Rochestor Carburetor (various views) | | |
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|                  Rochestor Solenoid - The correct version for the 429 CJ Mustang/Cougar (red/yellow wire) is shown above. The photo at right shows how the solenoid threads into the bracket and adjusts with a lock nut to keep it inposition. Also, A/C cars used the solenoid and non A/C cars used a dashpot.
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    GM Part Numbers on the Quadrajet: 7040285 = Manual Trans w/AC, 77040286 = Auto Trans w/AC, 7040287 = Manual Trans...