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RM-series Plymouth VINs
1968–1974 Plymouth Road Runner VIN Decoder
The RM prefix is one of the most recognizable classic Mopar VIN families. PetrolJunky combines RM with body code, engine character, model year, plant and sequence to create a structured Road Runner registry record.
Decoder coverage: 1968–1974
1968–1974 Road Runner Engine/body/year/plant Superbird non-inference safeguard
Decoder reference
What this decoder page is designed to answer.
The fifth character reveals the original engine family
Year-aware Chrysler engine tables can distinguish combinations such as 383 four-barrel, 426 Hemi, 440 and 440 Six-Pack where applicable. The same letter can mean something different in another year, so PetrolJunky never ignores the sixth-character model year.
Body codes are retained as factory facts
Hardtop/coupe and convertible body characters are exposed separately from the model name, preserving the original VIN structure for collector research.
A Road Runner VIN does not authenticate a Superbird
The Superbird was based on the Road Runner VIN family and requires additional body/fender-tag evidence. PetrolJunky intentionally returns the underlying Road Runner instead of transforming every compatible RM VIN into an aero car.
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