History Of Holley’s 6-Pack Carbs And Their Modern Reproductions

The legendary 6-Pack was comprised mainly of three Holley 2300 carburetors. Photo from www.hemmings.com.

Once Chrysler had entered the musclecar wars in the mid-1960s, the battle raged to new heights. Today the Dodge and Plymouth names are still highly regarded as key names in the musclecar market of the late 60s and early 70s. Performance buyers sought out the Dodge Super Bee, Dart Hemi 426, Coronet 426 Hemi, and even the Dart sport models for that extra little power these machines brought to the street. Even the barebones Polara earned its place as one of the decades truly great musclecars.

Chrysler 440ci Six-Barrel RB V8 in a 1971 Plymouth Barracuda. Photo from wikipedia.org.

At the very end of the decade, mid-way through the 1969 production year, Chrysler launched a major salvo in the musclecar war by offering the A12 option package on the Dodge Super Bee and Plymouth Road Runner. This bullet was the 440 Six-Pack, and it represented a little more bang for the already impressive Hemi. The 440 Six-Pack name was reserved for Dodge models with the Plymouths getting the 6-Barrel moniker. Either name played into the musclecar war theme.

These A12 options featured an aluminum Edelbrock intake manifold that was stacked with a trio of Holley 2300 carbs on top. The setup relied on the 350 cfm Holley for starting and cruising, and the two outboard 500 cfm Holleys got into the action when the driver stepped on the pedal. This system was designed to be nice and tame for the street, less expensive, but packed with performance when needed.

True that there was more to the A12 package than just the Six-Pack carb system. The connecting rods were upgraded, a different harmonic balancer was used, moly top piston rings, different camshaft, hydraulic tappets, chrome intake and exhaust valve stems, and the compression was raised to 10.5:1. Chrysler made just 3,384 of the A12s, all for 1969. The 440 Six-Pack became a stand-alone option for 1970, on models including the Charger, Challenger, Coronet, GTX and Barracuda, although the specifications changed a wee bit, including replacing the Edelbrock manifold with a Chrysler cast-iron manifold. The option remained available through 1971

Over the years the highly desirable Six-Pack was difficult to replace or restore due to lack of available parts. This all changed in the past decade as Holley began to reproduce the original Six-Pack Holley Carburetors.

The combination of a center 350 cfm carb with two outter 500 cfm carbs totals a whopping 1,350 cfm, which laid waste to a lot of Goodyear rubber. Holley’s reproduction units are extremely close to the original units and each still look like a 4150 Holley carb cut in half.

Holley’s 500 cfm carb list number 0-4365-1 is the two “Outboard” Six Pack Carburetors that Originally came on 1969-70 Chrysler 440ci 390hp Engines. The original castings had the OE part number 3462373.

The 350 cfm center carb is Holey list number 0-4144-1that originally came on 1969-70 Chrysler 440ci  390hp engines.  The original castings will have the OE par number 3418550.


  • Gold dichromate finish for corrosion resistance and classic Holley looks
  • 500 cfm model 2300 outboard carburetor
  • 350 cfm model 2300 center carburetor
  • Vacuum operated for seamless operation
  • Calibrated as a replacement for 1969-70 Chrysler 440ci 390hp engines
  • Fuel inlets for original factory fuel lines
  • Original list number stamped with current date code
  • No choke for unobstructed airflow on 500 cfm outboard carbs
  • Remote choke for easy hook up original vehicle on 350 cfm center carb
  • Factory style metal throttle linkage
  • All OE vacuum hook-ups
  • 100-percent wet-flow tested by Holley technicians to assure it arrives ready to run

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About the author

Bobby Kimbrough

Bobby grew up in the heart of Illinois, becoming an avid dirt track race fan which has developed into a life long passion. Taking a break from the Midwest dirt tracks to fight evil doers in the world, he completed a full 21 year career in the Marine Corps.
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