BENTLEY MARK VI
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 501 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
choose your series
| Release dates | Car model | Chassis number | Modification | Modification introduced at |
| Nov. 46 to Jul. 47 | Mark VI (MK 6) | B2AK to B254AK | Servo Damper | B70AK |
| Apr. 47 to Oct. 47 | B1AJ to B247AJ | Squirt hole in connecting rods | B126AK | |
| Shock absorber screwed inserts | B250AK | |||
| Twin ignition coils, parkerised tappets | B1AJ | |||
| Hardened push rods | B31AJ | |||
| Modified horn push button | B185AJ | |||
| Jun. 47 to Jan. 48 | Mark VI (MK 6) | B2BH to B400BH | AC air cleaner, SC carburetter needles, strengthened wheel disc flange | B2BH |
| Sep. 47 to Mar. 48 | B1BG to B401BG | Heater return tap deleted, heater drain tap added | B70BH | |
| Provision for 5" dynamo | B112BH | |||
| Rocker cover breather | B198BH | |||
| Modified interior door locks | B228BH | |||
| Increased synchro cam angles | B292BH | |||
| Modified distributor drive, spring ring, increased front shock absorber | B398BH | |||
| Loading | B185BG | |||
| Nebar rocker cover joint | B303BG | |||
| Export body modifications | B321BG | |||
| Dec. 47 to Aug. 48 | Mark VI (MK 6) | B2CF to B500CF | Aluminium tappet doors, large rear hub bearing | B2CF |
| Mar. 48 to Dec. 48 | B1CD to B501CD | Bronze exhaust valve guides | B26CF | |
| Modified clutch thrust race | B164CF | |||
| Solid door striker plates | B206CF | |||
| Horn suppressor | B218CF | |||
| Dunlop jacks | B236CF | |||
| Wider opening radiator shutters | B320CF | |||
| 2.4" servo balance lever | B344CF | |||
| 5" dynamo | B426CF | |||
| C. & A. cylinder head gasket, accelerator countershaft guard | B1CD | |||
| 13° brake expanders, 25° servo cams | B17CD | |||
| Modified coolant pump | B115CD | |||
| Improved rubber door seals, servo protection plate | B347CD | |||
| Modified quicklift window stop | B363CD | |||
| Extended petrol tank breather | B475CD | |||
| Jul. 48 to May 49 | Mark VI (MK 6) | B2DA to B500DA | Low lift camshaft, Lucas screen wipers, modified core plugs | B2DA |
| Oct. 48 to Jan. 49 | B1DZ to B501DZ | Oil caps in No.7 journal | B62DA | |
| Bench type spring drive | B128DA | |||
| Longer upper triangle levers | B134DA | |||
| Short cylinder inserts | B144DA | |||
| Rear shock damper linkage modification | B200DA | |||
| Battery charging plug | B252DA | |||
| Larger frontal area radiator, anti-spill valve in radiator | B270DA | |||
| Chromium-plated servo plate | B384DA | |||
| Strengthened door hinges | B420DA | |||
| Increased diameter scuttle drain | B492DA | |||
| 3/8 in. cylinder studs | B95DZ | |||
| N.S. front window winder | B117DZ | |||
| Improved window run channels | B131DZ | |||
| Square edge bearings, 1st and 3rd mot. shafts | B150DZ | |||
| Strengthened 3rd mot. shaft splines | B159DZ | |||
| 8 1/2" deflection front springs, radiator heated de-mister, dip and switch headlamps | B193DZ | |||
| Modified underseat heater, export features on all cars, fixed guide to front windows | B237DZ | |||
| 22 1/2° servo cams, 3" balance levers | B241DZ | |||
| Heater return tap re-introduced | B273DZ | |||
| Revised inter-shoe brake linkage | B493DZ | |||
| Feb. 49 to Nov. 49 | Mark VI (MK 6) | B2EY to B500EY | Split skirt pistons | B2EY |
| Jun. 49 to Feb. 50 | B1Ew to B501EW | Granodised piston rings | B120EY | |
| Portable hand inspection lamp | B162EY | |||
| Luggage boot water trap | B264EY | |||
| Progressive bump stops | B466EY | |||
| 3/8 in. dia. rear axle bolts | B1EW | |||
| Closer fitting tappets | B57EW | |||
| Commonised dash | B273EW | |||
| Forged rear spring shackle bracket | B403EW | |||
| Sep. 49 to Mar. 50 | Mark VI (MK 6) | B2FV to B500FV | Internal oil feed to distr. | B2FV |
| Dec. 49 to Jul. 50 | B1FU to B601FU | Longer gear lever | B138FV | |
| Modified rear s.d. plates | B444FV | |||
| Trico windscreen washer | B1FU | |||
| Modified s.s. tube socket | B244FU | |||
| Modified x.s. tube sockets | B281FU | |||
| Apr. 50 to Sep. 50 | Mark VI (MK 6) | B1GT to B401GT | Revised steering geometry, thicker lipped brake drums, anti-rumble brakes | B1GT |
| 2nd mod to rear s.d. plates | B67GT | |||
| Four foot mounted air silencer | B111GT | |||
| Improved rear no. plate box, revised bijur pipes to rear shackles | B165GT | |||
| Reduced speed fan | B213GT | |||
| Keyhole sockets on gear control | B281LGT | |||
| One piece rear brake equlever | B381GT | |||
| Jul. 50 to Jan. 51 | Mark VI (MK 6) | B2HR to B250HR | Aluminium cam wheel, electric clock, low rate oil feed to clutch thrust, 11" clutch (light type), 3 bush rear brake equ-support, mod. starter solenoid switch | B2HR |
| Jul. 50 to Mar. 51 | B1HP to B251HP | Lower bush r.s.d. link deleted | B11HR | |
| Speedo dip warning light | B31HP | |||
| Large bore carburetters, mod. clutch spigot bearing | B83HP | |||
| Closer fitting 2nd & 3rd speed bushes | B95HP | |||
| Triple pass de-mister inter. scheme | B149HP | |||
| Longer bosses on r.s.d. plates | B179HP | |||
| Sep. 50 to Feb. 51 | Mark VI (MK 6) | B2JO to B250JO | Thicker r.s.d. plates | B2KM |
| Nov. 50 to May 51 | B1JN to B251JN | Mod. water pump gland ring | B61JN | |
| Jan. 51 to Jul. 51 | Mark VI (MK 6) | B2KM to B200KM | Triple pass r.h. de-mister (final) | B2KM |
| Feb. 51 to Dec. 51 | B1KL to B201KL | Modified ammeter | B64KM | |
| New type ignition condenser | B117KL | |||
| Mar. 51 to Sep. 51 | Mark VI (MK 6) | B2LJ to B400LJ | Steel oil caps in crankshaft | B40LJ |
| May 51 to Dec. 51 | B1LH to B401LH | Oil feed adaptor air bottle | B170LJ | |
| 11" heavy type clutch | B300LJ | |||
| Jul. 51 to Jan. 52 | Mark VI (MK 6) | B2MD to B400MD | 3 5/8 in. bore engine, thickened crankshaft webs, full flow oil filter, twin exhaust system (r.h. cars only) | B2MD |
| Sep. 51 to Feb. 52 | B1MD to B401MD | Side scuttle ventilators | B29MB | |
| Insulated dynamo | B313MB | |||
| Nov. 51 to May 52 | Mark VI (MK 6) | B2NZ to B500NZ | Increased front damping | B210NZ |
| Feb. 52 to Sep. 52 | B1NY to B501NY | Twin condensers | B292NZ | |
| Sp carb. needles (r.h. cars only) | B478NZ | |||
| Short dwell detent on 1st gear selector | B500NZ | |||
| Repositioned oil gauge conn. on crankcase | B123NY | |||
| Stiffened clutch casing | B253NY | |||
| 3-position heater and de-mister switches, 120° opening ventilator windows, rear window de-mister | B311NY | |||
| Apr. 52 to Jul. 52 | Mark VI (MK 6) | B2PV to B300PV | Reversion to old type front wheel studs | B22PV |
| B1PU to B301PU | Solid pins and shield on servo | B284PV | ||
| Hot and cold de-mister | B53PU | |||
| Exhaust heat shields | B159PU | |||
| Needle rollers in clutch release levers | B185PU | |||
| Reduced friction on steering connections | B215PU |
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