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What the “Six-Pack” Road Runner GTX was
The name refers to a 1972 Road Runner GTX ordered with Chrysler’s 440-cubic-inch V8 and three two-barrel carburetors. Plymouth’s period terminology was 440 6-BBL or 440 Six Barrel; Dodge used Six Pack. The three-carburetor layout gave the large V8 a distinctive induction system, but the name alone does not establish that a particular car left the factory that way.
In 1972, GTX was no longer a separate Plymouth model as it had been through 1971. It was an identity or package associated with a Road Runner equipped with a 440. The standard top engine was the 440 with a four-barrel carburetor; the Six-Barrel version was planned but did not become a continuing regular option. Hot Rod’s account of the 1972 car describes the model-year change and the planned configuration.
How Plymouth’s 440 Six-Barrel fits the earlier history
1969: the Road Runner A12
Plymouth had already used the 440 Six-Barrel in the 1969 Road Runner A12 package. That setup used three Holley two-barrel carburetors on an Edelbrock aluminum intake. Hot Rod reports a Plymouth/Chrysler factory-dyno figure of 390 hp at the flywheel for the 1969 application; that figure belongs to the A12-era car, not the exceptional 1972 builds. Hot Rod’s A12 history covers the engine and its reported output.
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1970–1971: a regular performance option
The 440 6-BBL became a regular performance option in 1970, including for the Plymouth GTX and Road Runner. The hardware still used three Holley two-barrels; Hemmings reports that Chrysler switched to its own cast-iron intake for 1970. Plymouth’s Six Barrel and Dodge’s Six Pack were the respective brand names for the related triple-carburetor arrangement. Hemmings’ 1970 GTX feature discusses the option and hardware.
Why the 1972 option was reportedly canceled
Hot Rod reports that Chrysler’s spring 1971 product materials listed a 440 Six-Barrel choice for the 1972 Road Runner GTX and Dodge Charger. According to that feature, three 1972 440+6 cars were known, all built in August 1971 before the option was canceled. The article says the engine was apparently canceled because it did not meet 1972 emissions standards.
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That explanation should be treated as reported history rather than a verified official finding. The available accounts do not provide a primary cancellation order or a specific EPA certification decision, and no named Chrysler official’s statement explaining the cancellation is established here. A forum discussion points to an image said to be from the 1972 Plymouth dealership data book as evidence that the option was planned, but the poster’s emissions explanation is interpretation, not an official record. The discussion and its quoted literature reference are useful context, not proof of the cancellation’s cause.
What “denied” means in the story
The word “denied” comes from the story of one claimed 1972 V-code Road Runner GTX. Hot Rod recounts that owner Russell Morgan sought confirmation from a Chrysler figure and was told the car was bogus or had never been built. The same feature describes evidence supporting Morgan’s individual car: a V-code VIN, a title, period literature, and a correctly dated set of carburetors. It also recounts Morgan’s memory of a swap-meet conversation: “I told him it was a 1972 Six Pack Road Runner GTX, and he said he had been looking for that car for years.” That is an owner’s recollection, not a documented corporate statement.
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So “denied” does not establish a formal Chrysler policy to suppress all 440+6 cars, nor does it prove the often-repeated theory that the company denied them to avoid EPA penalties. The feature presents competing explanations for how a car might have escaped cancellation as theories. It supports a case for the specific car, but it is not a complete factory production ledger or official record of a company-wide denial.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess a claimed factory 1972 440+6 car
A triple-carburetor setup by itself is not proof of original factory configuration. For a claimed example, compare the car’s identity and documentation rather than relying on the engine appearance alone:
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- Model identity and badging: Establish that the car is a 1972 Road Runner with GTX identity or equipment, rather than assuming GTX was still a separate model.
- Engine configuration: Distinguish the ordinary 440 four-barrel from the claimed 440 6-BBL with three two-barrel carburetors.
- Build timing: Compare the documented build date with Hot Rod’s report that the known 440+6 cars were built in August 1971 before cancellation.
- Supporting records and components: Check the VIN, title, period product literature, and date-coded components together. A single clue does not independently prove the factory specification.
A 2006 Hot Rod account also described “a few” 1972 440+6 examples, but it does not settle an exact total. The later report’s “three known” is therefore a count attributed to Hot Rod’s reporting, not a proven total of every car built. The 2006 Hot Rod feature provides earlier specialist coverage without resolving that number.
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