Released in February 1969, Plymouth offered their potent 440 ‘Six Pack’ engine in the Road Runner with a package called A12. This included the potent 440 in³ engine, Edelbrock manifolds, three Holley carburetors, a distinctive fiberglass hood and bare H-Series wheels. With these simple changes, the Roadrunner was much more than its Warner Brothers roots would suggest. Motor Trend named it “Car of the Year” in 1969.
The A12 engine was typical of the other 440 Six Packs found on other Mopars and included a sweet set of upgrades. Aside from the three dual-throat Holey carburetors, the 440 included an aluminum Edelbrock intake manifold, chromed valve stems, magnafluxed connecting rods and heavy duty valve springs. As an option customers could order different pushrods with a more aggressive camshaft. Unfortunately, this engine was only produced in 1969 over a three month period. NHRA rated the engine at 410 bhp. The fitted Edelbrock intake manifold was the first production OEM manifold produced by by Edelbrock.
All A12 440s received a signature lift-off fiberglass hood which was fastened by hood pins. It was the only Mopar to receive such a treatment from the factory. Other goodies included rare G70-15 Goodyear Polyglas tires with red stripes, 15×6 H-Series wheels with chrome lug nuts, a Dana 4.11:1 differential and 11-inch drum brakes.