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Carter AFB carbs used by Pontiac

Year Engine Model information Number SSB * CFM ** Kit number

1957 8 347 A/T 27, 28 2506 2767 610 572

1958 8 370 A/T 25, 27, 28 2740 2767 610 572

1958 8 370 S/T 25, 27, 28 2751 2768 610 572

1958 8 370 A/T 25, 27, 28 2767 3651 610 563

1958 8 370 S/T 25, 27, 28 2768 3650 610 572

1959 8 389 S/T 21, 24, 27, 28 2820 3123 610 563

1959 8 389 A/T 21, 24, 27, 28 2819 3320 610 563

1960 8 389 Super Duty 3010 625 828

1960 8 389 S/T 21, 23, 24, 27, 28 2975 3123 610 563

1960 8 389 A/T 21, 23, 24, 27, 28 2976 3326 610 563

1961 4 195 SD Tempest 3266 625 828

1961 8 389 S/T 23, 25, 26, 27, 28 3123 4243 610 586

1961 8 389 A/T 26, 27, 28 3124 3326 610 586

1961 8 389 A/T 23, 25 3125 3326 610 586

1961 8 389 SD (single 4) 3298 625 828

1962 4 195 S/T SD Tempest 3266 625 828

1962 8 389 A/T (3 speed) 23 3326 3651 610 586

1962 8 389 A/T (4 speed) 26 3300 3326 610 586

1962 8 389 S/T 23, 26 3123 4243 610 586

1962 8 389 SD (single 4) 3298 625 828

1962 8 421 SD (Rear of 2) 3435 625 558

1962 8 421 S/D (Single 4) 3443 750 578

1962 8 421 S/D (Single 4) 3444 675 550

1962 8 421 S/D (Single 4) 3596 750 550

1962 8 421 SD (Front of 2) 3433 625 558

1963 8 326 A/T Tempest 3502 3651 575 586

1963 8 326 S/T Tempest 3477 3650 575 586

1963 8 389 S/T 28 3479 3647 575 586

1963 8 389 A/T (4 speed) 3300 3326 575 586

1963 8 389 A/T (3 speed) 3326 3651 575 586

1963 8 421 SD (Front of 2) 3433 625 558

1963 8 421 SD (Rear of 2) 3435 625 558

1963 8 421 S/D (Single 4) 3443 750 578

1963 8 421 S/D (Single 4) 3444 675 550

1963 8 421 A/T 3545 3651 575 549

1963 8 421 Super Duty (3 barrel) 3636 939 591

1963 8 421 S/T 3574 3650 575 586

1963 8 421 S/D 3596 750 550

1964 8 326 S/T Tempest 3686 3650 575 586

1964 8 326 A/T Tempest 3687 3651 575 586

1964 8 389 S/T 3647 3650 575 586

1964 8 389 A/T 3648 3651 575 586

1964 8 389 A/T GTO 3649 3651 575 586

1964 8 421 S/T 3650 575 586

1964 8 421 A/T 3651 575 549

1965 8 326 A/T Tempest 3900 3651 575 586

1965 8 326 S/T Tempest 3899 4243 575 586

1965 8 389 S/T 3895 4243 575 549

1965 8 389 A/T 3896 3651 575 548

1965 8 421 S/T 3895 4243 575 549

1965 8 421 A/T 3898 3651 575 548

1966 8 326 A/T California 4031 4246 575 583

1966 8 326 S/T Tempest 4035 4033 575 586

1966 8 326 A/T Tempest 4036 4031 575 583

1966 8 389 A/T 4034 4244 575 584

1966 8 389 S/T California 4041 4245 575 586

1966 8 389 A/T California 4030 4244 575 584

1966 8 389 S/T 4033 4243 575 586

1966 8 421 S/T 4033 4243 575 586

1966 8 421 A/T 4037 4242 575 584

1966 8 421 S/T California 4041 4245 575 586

1967 8 326 S/T 4243 575 2205

1967 8 326 S/T (California) 4245 4248 575 890

1967 8 326 A/T (Tempest) 4246 3651 575 870

1967 8 326 A/T (Tempest)(California) 4248 575 891

1967 8 400 A/T 4242 3651 575 867

1967 8 400 S/T 4243 575 2205

1967 8 400 A/T (California) 4244 4248 575 891

1967 8 400 S/T (California) 4245 4248 575 890

1967 8 400 A/T Grand Prix 4413 4242 575 870

* SSB (superceded by) – the carburetor in the second column can be used for the carburetor in the first column.

** CFM, with the exception of 3636S, is approximate. All Pontiac AFB carburetors, with the exception of the SD units, were built on a 610 CFM frame. The later units, noted as 575 CFM, can be converted to the full 610 CFM by replacing the hot idle compensator with the earlier hot idle compensator (Carter 169-43S); or by removing the hot idle compensator and plugging the passage (not recommended for street driven vehicles with auto transmission). The early Super Duty units were built by modifying a Chevrolet 625 CFM platform. Later Super Duty units were built by modifying a Chrysler platform.

Issues with using aftermarket AFB’s on Pontiacs.

Carter produced four separate groups of aftermarket AFB’s, that may be of interest to Pontiac enthusiasts.

The first group consists of 4758s (500 CFM manual choke); 4759s (625 CFM manual choke); 4760s (750 CFM manual choke); 4761s (500 CFM chokeless); and 4762 (750 CFM chokeless). These carburetors are the original “Competition Series” units, and were basically designed form racing; or very high performance street use on non-smog-emission vehicles. This group of AFB’s were released in 1969.

The second group all have electric chokes and consist of 9400s (400 CFM Chevrolet linkage); 9500s (500 CFM Chevrolet linkage); 9501s (500 CFM Chrysler linkage); 9625s (625 CFM Chevrolet linkage); 9626s (625 CFM Chrysler linkage); and 9627s (625 Ford linkage – with kickdown lever). This group of AFB’s were released in 1972.

The third group is basically a remake of the second group by adding a plugable EGR port and bowl vent (for emissions) and renumbering the carburetor by adding 10 to the number. The 9400s became the 9410s. Similiarly; 9500s became 9510s, 9501s became 9511s, 9625s became 9635s, 9626s became 9636s, and 9627s became 9637s. This group of carburetors was released in 1982.

The three groups above utilized pressure casting dies to cast the bodies. The fourth group came later and utilized vacuum casting to cast the bodies. These will not be discussed.

Issues in installing one of these carburetors on a Pontiac include: large air cleaner opening (5 1/8 vs 4 ¾ inches); front fuel inlet (same as SD carbs, but different from normal Pontiac carbs); aggressive secondary airvalve (angle of plates much larger than used by Pontiac) creating secondary bog; metering rod profile is much different than Pontiac profile – too much difference between high vacuum and low vacuum steps.

Sunday, January 18, 2004 Page 3 of 3