The chassis number for these models is composed of two initial fixed letters 'BC', followed by a number that can go from 1 to 78. Final letter that determines the series of the model.
Usually the chassis number for these mdoels can be found on the firewall.
Release dates
Chassis number
Modification
Modification introduced at
Jun. 52 to Apr. 53
BC1A to BC26A
Reduced compression height pistons
BC19A
Apr. 53 to Sep. 53
BC1B to BC25B
Aug. 53 to Jul. 54
BC1C to BC78C
Commonised cylinder head
BC4C
Deletion of non-opposed springs in side steering tube
BC18C
All welded frame
BC21C
Deletion of reduced friction modifications on steering connections
BC30C
Introduction of B.VI type gearbox tie rod
BC50C
Flywheel inertia rings on cars fitted with auto gearbox
BC70C
Thicker third motion shaft thrust washer
BC78C
Jul. 54 to Mar. 55
BC1D to BC74D
3 3/4" bore engine, compensator pipe between front and rear servo
BC1D
Strengthened jaws on front brake operating links
BC5D
Eliminations of chromium-plated servo pressure plate
BC12D
Flexibox seal in water pump
BC35D
Long stroke starter pinion
BC37D
Improved cold starting device
BC43D
2nd speed start
BC47D
Apr. 55 to Apr. 55
BC1E to BC9E
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