AVS The AVS design debuted...
The AVS design debuted on the new 340 and 383/335hp model of 1968 and would be the mainstay for the most popular years of the musclecar era. Externally, they differed from the AFB with top-mounted flapper doors, repositioned idle-mixture screws, and a lower-mounted choke cut-off, not to mention the letters A V S cast into the bowl area at the rear. Like the AFB, the date code and part number are located right in front of the passenger-side mounting flange.
All of the OE Holley four-barrels used on factory Mopars were of the 4160 variety, using vacuum secondaries and a fuel balance tube that ran between the bowls on the driver side, with evenly sized barrel openings when viewed from the bottom. The easiest way to differentiate them from other Detroit versions is again the throttle-stud mounting bracket. The fuel line inlet is at a downward angle on the driver side as well. Other than that, they're similar to most others of that time.
In 1969 Chrysler selected Holley for the new triple two-barrel layout, commonly called the Six Pack after Dodge's slogan. These used the throttle-stud bracket specific to Chrysler on the primary (or center) carb; the secondaries have no metering blocks and large vacuum spring housings and all use a fuel line inlet located at a 45-degree downward angle on the passenger side.
Some Final Notes
This article is a basic introduction. There are several sources for additional information, primarily books published by Galen Govier's GTS company. These books come in a variety of pocket-size formats and are an invaluable source for those seeking date-code information and parts for specific model years. For servicing, performance, and emissions purposes, virtually every application used a different part number, creating literally dozens of numbers, despite simple physical interchangeability between models.
Parts for most Holley carburetors are still available, though some Carter models may be difficult to find small parts for. Don't overspend on models with heavy modifications for competition, which may require serious rebuilding. The Carter units are now being manufactured as a subsidiary of the Edelbrock performance line.
Carburetors were one of the most delicate and fragile parts on any car and subject to the corrosive effects of fuel. Any used carb should be rebuilt and checked thoroughly for leaks and damage before being put into service. Spilled gasoline on hot intake manifolds is a recipe for certain disaster.
|Chase Chart-Chrysler Carbs|
|Carter AFB single four-barrel|
|1962||318 poly, 361-B, 383-B, 413-RB|
|1963||361-B, 383-B, 413-RB|
|1964||273-A, 361-B, 383-B, 413-RB|
|1965||273-A, 383-B, 426W-RB |
|1966||273-A, 383-B, 440-RB|
|1967||273-A, 383-B, 440-RB|
|Carter AFB dual four-barrel inline|
|1962||413-RB (300-H) |
|1964||426-RB (330-K) |
|1966||’71 426 Hemi|
|Carter AFB dual four-barrel cross-ram|
|(MW—Max Wedge by stage)|
|1962||413-RB (MW I)|
|1963||413-RB (MW I), 426-RB (MW II)|
|1964||426-RB (MW III), 426 Hemi (early)|
Holley The Holley was first...
The Holley was first used on a Chrysler vehicle with the '64 Race Hemi cross-ram package, but made its true street debut on '67 440 low-compression engines. It became more prevalent in 1970 on 383 engines and began to phase out in 1972 after a run on the entire 440 line. All Chrysler Holleys are 4160 models with vacuum-secondary operation. The part numbers on Holley carbs begin with R, and both that and the date code can be found on the forward-facing side of the choke air horn.
TQ How do you know this is...
How do you know this is a Mopar carb? These four pictures show the easiest way to identify it: the throttle-stud mounting bracket on the driver side, which had one large hole and often one small hole in the bracket. Shown are the AFB, AVS, Holley, and ThermoQuad brackets.