The HEMI, the Four-Speed and the Experimental Six-Speed
Short answer
The booklet describes the car with a 426 dual-plug HEMI (block 30), custom ignition and induction, an aluminum A-833 four-speed and a Dana 60 rear axle. A separate chapter describes an experimental B&M six-speed arrangement from the development program. That experiment is history; it is not a second transmission fitted today.
The package as the booklet describes it
According to pages 7 and 8 of the owner’s booklet, the engine is a 426 dual-plug HEMI identified as block number 30. Ignition is described as a custom Ron Killen system, with induction built around Mullens heads, a tunnel ram and modified Holley 1050 carburetors. The drivetrain is described as an aluminum A-833 four-speed feeding a Dana 60 rear axle.
Those are the details this site reports as the source-described specification. They are not repeated here as the result of a current inspection, and no displacement, horsepower or dyno figure beyond what the source states is added.
Booklet pp. 7–8The Car
Why two spark plugs per cylinder
The source describes the engine as dual-plug. For a collector, that distinctive configuration is something to inspect and document: whether the heads and the ignition system that feeds them are present today, how they are constructed, and what records connect them to the car’s history.
The experimental six-speed
Page 10 of the booklet describes a development arrangement pairing B&M and A727-based components into an experimental six-speed system, described in the context of spring 1970. It is presented as part of the program’s experimentation with how to launch and shift a Pro Stock car.
That chapter tells you what the engineers tried. It does not tell you what is installed in the car today. The booklet’s drivetrain description of the car is the A-833 four-speed. Reporting both as if they were current would be wrong, and so would treating the experiment as evidence about any surviving parts.
Booklet p. 10
Questions for the inspection
Is the engine block marked as described, and what documentation connects it to the program? Which ignition and induction components are period items, which are restored and which are replacements?
Does the transmission match the A-833 description, and does its history appear in any records? Is there any surviving experimental hardware, and if so, is it part of the sale? Are there spares, and are they listed?
These are the questions a specialist inspector is equipped to answer. The owner’s account gives the starting map; the inspection confirms the ground.
Questions collectors ask
Does the car have a six-speed today?
The booklet describes an aluminum A-833 four-speed for the car. The six-speed chapter concerns historical experimental development.
Is there a published horsepower or dyno figure?
No figure beyond the source is published here. Performance claims should come from documented tests.
Has the engine been independently inspected?
Current inspection is pending. The specification on this site is source-described, not an inspection result.
Continue with the car
Sources and page notes
Source-derived history is drawn from the owner-supplied booklet and the public archive. Editorial explanation is the project team’s own.
- Owner-supplied booklet (Proof 10), pp. 7–8 — engine, ignition, induction, drivetrain
- Owner-supplied booklet (Proof 10), p. 10 — experimental B&M/A727 six-speed development
- Owner-supplied booklet (Proof 10), p. 14 — engine development aims