Chassis Number References

Listed below are modifications made to the cars and the approximate Chassis number of their introduction.

Date	Details	MkVI/ R Type	Silver Dawn	SWB Silver Wraith	LWB Silver Wraith
November 1946	First MkVI produced	B2AK
February 1947	First SWB Silver Wraith produced			WTA1
April 1948	First RR Silver Dawn produced		SBA2
	Low lift camshaft	BDA2
	Lucas windscreen wiper motor	BDA2		WDC1
	3/8" cylinder head studs (previously 5/16")	B95DZ		WDC31
	LHF window winder	B117DZ
	Radiator heated demister	B193DZ		WFC1
	Dip and switch headlamps	B193DZ		WDC38
	Modified under-seat heater	B193DZ		WDC100
	Split skirt pistons	B2EY		WDC1
	Trico windscreen washer	B1FU		WHD1
August 1950	Later brake system introduced	B1GT	SCA1	WME1
	Reduced speed fan	B213GT	LSCA9	WHD77
	Large bore carburetters (SU)	B83HP
July 1951	4.5 litre engine (3 & 5/8" bore), full flow oil filter, 11" clutch	B2MD	LSFC2	WOF1
	Twin exhaust (RHD cars)	B2MD
January 1952	First LWB Silver Wraith produced				ALW1
	Single choke Zenith carburetter			WSG7
June 1952	First R Type Continental produced	BC1A
	Later type headlamp	B169NY	LSHD56
	3 position heater & demister switches	B311NY	SFC94	WSG45
	Rear window demister	B311NY
	First R Type produced	B2RT
August 1952	Last MkVI produced	B301PU
	Bigger boot	B2RT	SKE2
	Two speed windscreen wiper	B2RT		WVH1
	6.75 compression ratio head	B93TO	SMF62
	Flywheel inertia ring on cars with automatic gearbox	B236WH			CLW24
November 1953	Last SWB Silver Wraith produced			WVH116
	12/41 rear axle	B1YA	SRH2
	Twin exhaust system		SRH2
July 1954	3 & 3/4 " bore engine (R Type Continental)	BC1D
October 1954	4" longer bonnet				BLW39
February 1955	Last R Type produced	B250ZY
April 1955	Last Silver Dawn produced		SVJ133
	Last R Type Continental produced	BC9E
October 1955	S Type engine used				ELW1
December 1956	8:1 compression ratio engine				FLW60
January 1958	Last LWB Silver Wraith produced				GLW26