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Big Healey chassis decoding
Classic Austin-Healey VIN Decoder & Registry
Big Healeys use a compact but highly informative chassis prefix. PetrolJunky recognizes BN1, BN2, BN4, BN6, BN7, BT7, BJ7 and BJ8 identifiers, including common H and L formatting used on 3000 and left-hand-drive cars.
Decoder coverage: 1953–1967
Austin-Healey 100 Austin-Healey 100-6 Austin-Healey 3000 Mk I, II and III
Model VIN decoder guides
Explore the models we can decode.
1953–1956
Austin-Healey 100 VIN Decoder
Decode Austin-Healey 100 BN1 and BN2 chassis numbers while preserving the limits of what the chassis number can authenticate.
Open decoder guide → 1956–1959Austin-Healey 100-6 VIN Decoder
Decode Austin-Healey 100-6 BN4 and BN6 chassis numbers and distinguish the four-seat and two-seat body families.
Open decoder guide → 1959–1967Austin-Healey 3000 VIN Decoder
Decode Austin-Healey 3000 Mk I, Mk II and Mk III chassis numbers using both factory prefixes and reviewed serial ranges.
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Decoder reference
What this decoder page is designed to answer.
The prefix tells much of the Big Healey story
BN1 and BN2 identify the four-cylinder Austin-Healey 100, BN4 and BN6 identify the six-cylinder 100-6, and BN7, BT7, BJ7 and BJ8 divide the 3000 into seating and generation families. PetrolJunky accepts punctuation found on original plates and normalizes it for lookup.
Serial ranges refine the model
BN7 and BT7 were used on both Mk I and Mk II 3000s, so PetrolJunky uses reviewed serial boundaries to separate them rather than relying on the prefix alone.
Common questions
Austin-Healey VIN decoder questions
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