Six Pack
Chrysler's Six Pack package began life not as an engine option, but as part of a highly regarded, but low production, vehicle during 1969. This was the A12 combination, often referred to now as M-code cars due to that letter appearing on the VIN. The Dodge Six Pack Super Bee and 440-6BBL Road Runner were street fighters that could take on the best of them. The factory failed to guess how many could be sold and did not stock enough of the special pieces, so a lot of would-be buyers were disappointed.
For 1970, the Six Pack was available in both small- and big-block versions. The small-block option was limited to the 340-powered SCCA Trans-Am E-Bodies-the Challenger T/A and AAR 'Cuda-for that year only, though Norm Krause and Grand-Spauling Dodge would offer it as a popular, advertised, dealer-installed option on their new GSS Demons in 1971. For big-block bruisers, the 440 version was available in all performance models that supported big-block power: GTX, Road Runner, 'Cuda, and Sport Fury GT for Plymouth, and Charger R/T, Challenger R/T, and Coronet R/T for Dodge. the rarest of these now appears to have been the Sport Fury GT, as less than a handful of upscale customers opted for the tri-carb option.
Speculation at the time suggested the Six Pack might even replace the in-line twin AFB setup that had been on the Street Hemi since it was introduced in 1966. Changes in performance sales kept anything from happening to that package for the '71 model year, which was its final season in production cars. The Six Pack's last hurrah could have been a possible run of Super Stock package vehicles similar to the '68 Hemi Darts and Barracudas, which was proposed when the new Demon arrived on the scene in late 1970. NHRA, already tired of Mopar dominance, quickly made clear that any such cars would be factored into oblivion, and the final Six Pack cars were production street versions that came down the assembly line at the end of the '71 model year.