| Release dates |
Chassis number |
Modification |
Modification introduced at |
| Nov. 46 to Jul. 47 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
