The chassis number for these model its composed of an initial fixed letter which is B, followed by a number that can go from 1 to 756 and finally two letters of which the first one determines the series of the model.

Depending on the first 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
 Aug. 59 to Dec. 59  S-Type 2  B1AA to B325AA  Improved type crown wheel bolts (phase 1) B186AA 
 Nov. 59 to Jan. 60    B2AM to B326AM  Introduction of seamless propeller shaft B2AM 
       Hollow camshaft replaced by solid camshaft B80AM (excl. B322AM) 
       Automatic choke otter switch B112LAM 
       Sealed thermal delay switch B192AM 
       Improved type crown wheel bolts (Phase 2) B258AM 
       Engine vibration cushion fitted B288AM 
       Improved throttle controls on left-hand drive cars B310LAM 
 Jan. 60 to May 60  S-Type 2  B1BR to B501BR  Automatic choke - lagged air pipes B409BR 
 May 60 to Aug. 60    B2BS to B500BS  Bi-metal cover  B437BR 
       Butterfly valve B471BR 
       Modified hydraulic tappets B246BS 
       S1 type front silencer with modified pipes and flanges B418BS 
       Modified starter motor B422BS 
       SU carburetters B452BS 
       Fast idle cam bracket B462BS 
 Sep. 60 to Nov. 60  S-Type 2  B1CT to B445CT  New front shock damper mounting plate, brake pedal gap plate B1CT 
 Nov. 60 to May 61    B2CU to B756CU  Shortened extension cone on fan mounting; extension of radiator bottom outlet pipe and new bottom water hose B18CT 
       New radiator filler cap seal B223CT 
       New starter motor B417CT, B372CU 
       Valves and fittings, interior lights - changes to switching arrangements for instrument and capping rail lights and new map lamp B2CU 
       Dynamo mounting bracket, cylinder head assembly and valves. etc. B52CU 
       Operating handle fitted to centre vane of capping rail outlet duct, Cigar lighter with amber glow ring B180CU 
       New silencer assemblies B280CU 
       Additional cold air intake, horns under front apron instead of front wing B362CU 
       New front shock damper body B392CU 
       Valve rockers and shafts B398CU 
       Air conditioning unit under sheets changed from fibre glass to steel B504CU 
       Front brakes - material of front brake clevis pins changed B554CU 
       Ash trays in new front seat backs, additional parcel shelf speaker on non-division cars B556CU 
       Crankcase modified to raise oil level in camshaft trough B562CU 
       Air conditioning -Tecumseh HH compressor replaced by York Shipley B570CU 
       47’ servo cams reducing front to rear brake ratio, accelerator pedal stop on right hand drive cars, gearbox throttle valve control on right hand drive cars, 13:38 ratio crown wheel changed to 13:40 B576CU 
       Spare wheel compartment cover B592CU 
 Apr. 61 to Dec. 61  S-Type 2  B1DV to B501DV  New boot lock cam B59DV 
 Dec. 61 to Aug. 62    B2DW to B376DW  Petrol tank breather B81DV 
       Top mounting assembly electric window lift B167DV 
       Heat sink introduced into automatic choke system B175DV 
       New rear bumper support springs, sparking plug waterproof adaptor B231DV 
       Rear seat footrests, two matrices instead of one in heating and demisting system, rear window demister switch moved to instrument panel, sliding door to front door cubbv box, interior mirror support stiffened B415DV 
       Blue floodlighting to instruments, hand brake warning light fitted, flasher and headlamp flick switch fitted, improved heating system B415DV 
       New starter ring B457DV 
       Smaller ball catches and striker plates on fall tables in rear of front seats B467DV 
       New cigar lighters in rear B493DV 
       Door seals B497DV 
       Modified water connections B22LDW 
       Fuel pump capacity increased B28DW 
       Improved valve rockers B142DW 
       Rear lamps B148DW 
       Brake pedals ball crank lever B154LDW 
       Lighter steering on left-hand drive cars B192LDW 
       Reversion to original starter ring B208DW 
       New method of lubricating cam wheel B222DW