The chassis number for these model its composed of two initial fixed letter which are BC, followed by a number that can go from 1 to 202 and finally two letters of which the second one determines the series of the model.

Depending on the second letter of the last two letters of your chassis number you can determine what series your car is and look up any modifications done through the range.

(Left hand drive models have an L preceding the last two letters)

choose your series

Release dates Car model Chassis number Modification Modification introduced at
 Sep. 62 to Jul. 63  S-type 3 Continental  BC2XA to BC174XA  Lengthened starter relay cable BC24LXA 
       Improved radiator pressure relief valve BC72LXA 
       Top and bottom hoses, stainless steel wheel discs BC144LXA 
       Steering box modified to allow trapped air to be bled BC152XA 
       Two-shoe front brakes BC166LXA 
 Jun. 63 to Set. 63  S-type 3 Continental  BC2XB to BC100XB  Carburetters with modified float chamber lid and needle valve BC12LXB 
       Automatic gearbox torus cover BC74XB 
       Steering hose re-routed and heat shield fitted to steering box mounting arm on left hand drive cars BC12LXB 
 Nov. 63 to Nov. 65  S-type 3 Continental  BC2XC to BC202XC  New voltage regulator BC68XC 
       Hand brake cable system on right hand drive cars BC100XC 
       Heat shield fitted to right hand exhaust manifold BC116XC 
       Choke introduced into reversing light clrcuit BC122XC 
       Increased bore of carburetter vent popes BC124XC 
       Dynamo bracket BC148XC 
       Flywheel housing - bell housing underpan fitted (except export models to troplcal or dusty countries) BC152XC (except BC154XC) 
       Steering box spool valve and housing BC156XC 
       Link strip in place of starter solenoid cable, steering - modified power cylinder head BC158XC 
       Improved copper type battery cable BC172XC 
       Steering hoses re-routed on right hand drive cars BC182XC 
       New HT ignition cables with resistive cores BC184XC 
 Feb. 65 to Apr. 65  S-type 3 Continental  BC2XD to BC28XD  Ventilation holes provided !o flywheel housing bell housing BC22XD 
 Mar. 65 to Apr. 65  S-type 3 Continental  BCZXE to BC88XE  Camshaft BC6XE (except BC8XE) 
       Air conditioning - introduction of standard S3 demister blower unit on coachbuilt cars. also electrically operated valves and taps, increased capacity windscreen wiper motor (Park Ward 2-door) BC34XE 
       Interference fit cylinder liners BC64XE 
       New fuel pump, SU type AUJF 400 BC58XE