The 1970 AMC Rebel Machine and Plymouth Road Runner were both factory-built muscle cars, but their headline horsepower figures do not settle which is faster or easier to own. AMC rated the Machine’s 390 at 340 gross horsepower; Plymouth rated the Road Runner’s standard 383 at 335 gross horsepower, while offering optional 440 Six Pack and 426 Hemi engines. Those are period ratings, not a controlled comparison of two cars on the road.
How their factory performance ratings compare
The five-horsepower gap between the Machine and the standard Road Runner is too small—and too dependent on period rating conventions—to serve as a real-world performance verdict. The figures below are gross horsepower ratings, not modern net ratings or results from a comparable acceleration test.
| 1970 model and engine | Period gross rating | What the figure establishes |
|---|---|---|
| AMC Rebel Machine, 390 cu. in. | 340 hp | Hot Rod’s 2015 technical retrospective corroborates the period rating: Hot Rod. |
| Plymouth Road Runner, standard 383 cu. in. V8 | 335 hp | Listed in the 1970 Plymouth mid-size fact sheet reproduced by Over-Drive Magazine in 2024: Over-Drive Magazine. |
| Plymouth Road Runner, optional 440 Six Pack | 390 hp | Optional engine rating in the same Plymouth fact sheet: Over-Drive Magazine. |
| Plymouth Road Runner, optional 426 Hemi | 425 hp | Optional engine rating in the same Plymouth fact sheet; Chrysler’s catalog also identifies period engine codes: Mopar parts catalog. |
The Rebel Machine’s 390
The Machine was a distinct 1970 AMC performance model, listed separately in AMC’s manufacturer-submitted AMA specifications. Its 390-cubic-inch V8 was a modified production engine. SAE paper 700349 describes the modifications as intended to provide performance while retaining normal street-operation features; the paper’s abstract does not report a head-to-head Road Runner test. The AMA sheet gives the Rebel a 114-inch wheelbase and notes that its specifications were those in effect when compiled, subject to change without notice. It was issued September 25, 1969 and revised April 1, 1970. AMC 1970 AMA specifications · SAE paper 700349
The Road Runner’s engine choices
The Road Runner’s standard 383 was only one of its possible configurations. Plymouth’s 1970 fact sheet lists the 440 Six Pack and 426 Hemi as options, with substantially higher gross ratings than the standard engine. Chrysler’s performance-parts catalog provides corroborating identification information for the 383 and Hemi and lists the 440 Six-Barrel configuration. A comparison involving a specific Road Runner should therefore begin by confirming which engine it actually has, rather than treating “Road Runner” as one fixed performance specification. 1970 Plymouth mid-size fact sheet · Mopar parts catalog
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Which one is quicker?
The available ratings cannot establish a winner. No controlled, comparable acceleration or braking result is established here, and horsepower alone does not account for the car’s transmission, axle gearing, condition, tires, or modifications. A sound comparison is between two particular cars with their actual configurations documented—not between the model names or their nominal ratings.
- Confirm the installed engine and transmission, including whether the Road Runner has its standard 383 or an optional 440 Six Pack or Hemi.
- Check the axle gearing and any non-factory changes that affect how power reaches the road.
- Assess mechanical condition and completeness; two cars with the same engine can perform differently if their condition differs.
- Look for documentation supporting the car’s identity and claimed original configuration.
What distinguishes the Machine’s equipment?
AMC’s specification material identifies Machine-specific chassis and brake equipment, including a rear sway bar and front disc brakes on V8 models. A reproduction of the AMC brochure lists 15-by-7-inch wheels and E60-15 tires. These details help identify the model and matter when evaluating an individual car, but they do not by themselves produce a measured performance comparison. AMC 1970 AMA specifications · 1970 AMC Rebel Machine brochure reproduction
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Which is easier to own?
There is no established comparative ownership-cost, reliability, or current parts-availability winner. The cars differ in configuration, and the condition and completeness of a specific example can matter more to its likely repair needs than its badge. Do not assume one is categorically cheaper or simpler to maintain based on model reputation alone.
What to check before buying either car
- Identity and configuration: Match available documentation to the car’s claimed model, engine, and equipment. This is particularly important for a Road Runner, which could have several engines.
- Condition and completeness: Inspect the structure, mechanical systems, and missing or substituted components before estimating restoration or repair needs.
- Parts sourcing: Check availability and prices for the exact parts the car needs with suppliers before committing. Current stock and comparative costs are not established here.
- Repair budget: Base estimates on the particular car, its condition, and a realistic parts-sourcing plan—not a blanket assumption that either model is less expensive.
- Reference material: A factory service manual can help with maintenance and restoration, but current listings or availability have not been established.
What the evidence can—and cannot—tell you
AMC’s AMA sheet is manufacturer-submitted and reflects specifications in effect at compilation; the period Plymouth engine ratings available here come from a 1970 fact sheet reproduced by Over-Drive Magazine in 2024. The horsepower numbers are useful for understanding how each model was rated, but they are not independent measurements made under one test procedure. Current market values, repair costs, parts availability, and comparative reliability are not established, so evaluate the actual cars and verify current local costs before making a purchase decision.
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