Corvanantics Corvair 95 Component Codes

The codes and accompanying information have been acquired from a variety of authoritative sources and GM documents. The abbreviations "AM" and "P&A" identify information from Corvair 95 Assembly Manuals and GM Parts and Accessory manuals, respectively. An asterisk(*) marks parts for which there are original GM engineering drawings or other engineering documents. This analysis has resulted in some new interpretations of part histories and occasional corrections to earlier documents.

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Patterns, Castings vs Machined Parts
Engine Codes
Transmissions
Differentials
Carburetors
Distributors and vacuum advance
Cylinder heads
Generators, Alternators, Regulators

Patterns, Castings vs Machined Parts - Codes, Numbers and Dates - click on image to enlarge
Patterns and Castings	Several of the powertrain components were, or incorporated, parts made in a foundry. Some were cast in steel (transmission and differential cases, exhaust manifolds), others in aluminum (engine blocks, heads, and rear housing), and carried codes, part numbers and/or dates of manufacture. To make these components, molds were created by packing sand around a pattern (prototype) of the part to be produced. Each component was embossed with a unique part number, but there were multiple copies of the pattern (to maximize production rate), and each pattern carried a unique identifier, such as GM1, GM2, GM3, etc. Thus, there would be no difference between components with different pattern numbers but the same part number. Additionally, each casting was embossed with a casting date. Casting dates - In the casting date, the month is identified by a letter A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun, G = Jul, H = Aug, I = Sep, J = Oct, K = Nov, L = Dec The month is followed by the day, and then a single digit for the year. The codes themselves were on embossed plates screwed to the pattern, allowing the date code to be changed day to day. The shape of the screw heads on either side of the date code signifies which shift poured the casting: 1st shift with two flat-head, 3rd shift with two round-head screws, and 2nd shift with one of each.
Machined parts	A cast usually was subsequently machined to the final specifications; and the same pattern could yield different final forms, each with its own machined part number. These are the part numbers usually found in the Parts and Accessories catalogs (but not on the part itself). The machined parts were engraved with production codes and dates, which are decribed below.

Patterns, Castings vs Machined Parts - Codes, Numbers and Dates

- click on image to enlarge

Patterns and Castings

Several of the powertrain components were, or incorporated, parts made in a foundry. Some were cast in steel (transmission and differential cases, exhaust manifolds), others in aluminum (engine blocks, heads, and rear housing), and carried codes, part numbers and/or dates of manufacture. To make these components, molds were created by packing sand around a pattern (prototype) of the part to be produced. Each component was embossed with a unique part number, but there were multiple copies of the pattern (to maximize production rate), and each pattern carried a unique identifier, such as GM1, GM2, GM3, etc. Thus, there would be no difference between components with different pattern numbers but the same part number. Additionally, each casting was embossed with a casting date.

Casting dates - In the casting date, the month is identified by a letter

A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun,
G = Jul, H = Aug, I = Sep, J = Oct, K = Nov, L = Dec
The month is followed by the day, and then a single digit for the year.

The codes themselves were on embossed plates screwed to the pattern, allowing the date code to be changed day to day. The shape of the screw heads on either side of the date code signifies which shift poured the casting: 1st shift with two flat-head, 3rd shift with two round-head screws, and 2nd shift with one of each.

Machined parts

A cast usually was subsequently machined to the final specifications; and the same pattern could yield different final forms, each with its own machined part number. These are the part numbers usually found in the Parts and Accessories catalogs (but not on the part itself). The machined parts were engraved with production codes and dates, which are decribed below.

Engine Codes Where to find the ID codes- click on image to enlarge Engine codes are located on the rear of the egine block, visible below the fuel pump These codes consist of a Source code followed by the assembly month and day, followed by an Engine code
1961 Engines- standard 80 HP engine was only option
code	Part #	Application
V	3795113	manual transmission
VA	3795117	manual transmission and RPO 225 (export, low compression)
VB^¥	3814451	manual transmission and COPO 2478 (prototype A/C)
W	3795115	RPO 667 (powerglide transmission)
WA	3795119	RPO 667 and RPO 225
WB^¥	?	RPO 667 and COPO 2478
^¥A prototype A/C unit was under development in 1961 and appears to have been initiated as COPO 2478 and intended as a mid-1962 release as FAO 136. The engines were given codes of VB and WB. Two of the engines were produced in 1961, although production in 1962 is unknown. Documents for 1962 refer to the option either as COPO or FAO (and as "VD" in one case), possibly reflecting progress (or some indecision) as it moved toward release. Howwever it was cancelled, likely due to cost and inability to cool the large interior FC volume.
1962 Engines - standard 80 HP engine was only option
code	Part #	Application
V	3819933	manual transmission
VA	3819969	manual transmission and RPO 225 (export, low compression)
VB^¥	3819511	manual transmission and FAO 136 (with prototype A/C)
VD^¥	3820191	manual transmission with COPO 2478 (with prototype A/C)
W	3819967	RPO 667 (powerglide transmission)
WA	3819971	RPO 667 and RPO 225
WB*	3819513	667 and FAO 136
^¥ See notes with 1961 codes.
1963 Engines - standard engine was 80 HP; 102 HP engine was COPO (Central Office Production Option) 9552
Code	Part #	Application
V	3821809	manual transmission
VA	3821823	manual transmission and RPO L90 (export, low compression)
VD^¥	3834724	COPO 9552A (102 HP engine with manual transmission)
VE	3839393	COPO 9552B (102 HP engine with manual transmission and HD clutch)
W	3821815	RPO M35 (powerglide transmission)
WA	3821825	with RPO L90 and RPO M35
WC	3841999	COPO 9552C (102 HP engine with RPO M35)
^¥The best discussion of the COPO 102 HP FC engine is found in the article by Dave Newell in the 2018 CORSA Communique 39(9).
1964 Engines - standard engine was 95 HP; 110 HP engine was RPO L62
Code	Part #	Application
V	3851815	95 HP with manual transmission
VA	3851817	95 HP with manual transmission and RPO L90 (export, low compression)
VB	3851335	110 HP engine with manual transmission
W	3817085	95 HP with RPO M35 (powerglide transmission)
WA	3817089	95 HP with RPO M35 and RPO L90
WB	3851339	110 HP engine with RPO M35
1965 Engines - standard engine was 95 HP; 110 HP engine was RPO L62
Code	Part #	Application
RS	3874419	95 HP with manual transmission
RV	3874413	95 HP with powerglide
RX	?	110 HP and manual transmission
RU	?	110 HP and powerglide

Transmissions Where to find the ID codes - click on image to enlarge On '61 & '62 MTs the ID code is on the differential mounting boss, upper left side On '63 - '65 MTs the ID code is on boss, lower left side On '61 - '65 PGs the ID code is on the right hand side of casting and middle pan mounting boss. '61 MT codes include the type code and assembly month and day. '63 - '65 MT codes include type code and assembly month and day. Codes of PG transmissions have the type code and the assembly, month, day and shift (D=day or N=night) Transmission Sources: MTs from Saginaw; PG from Toledo Some other distinquishing features A backup light was never used in the FC, the hole in the case for the switch was usually drilled but plugged, as in this transmission. In 1964 the lube drain hole (red circle) was eliminated from the 4-speed transmission. The green circle is the differential drain hole.
1961 Transmissions
Code	Application	Part #	Case #	Gear ratio, notes, etc.
ST	3 Speed MT	The standard equipment 3 speed manual transmission was the only transmissions to have a large, stamped steel access panel on the top.
		3785446	3784344	1st-3.50 2nd-1.99 3rd-1.00 rev-3.97 (1961 AM)
SF	4 Speed MT	See table below for detailed descriptions of 4 speed transmissions
		3785452* (early)	3782978*	1st-4.26 2nd-2.35 3rd-1.48 4th-1.00 rev-4.27
		3785452* (early)	3785452 - was the "1st design" '61 4sp transmission. It's identified in the earliest P&A catalogs and the engineering documents indicate it to have a 4.26 1st gear; changes to the engineering document correspond with those described in Technical Service Bulletin #690. [See notes below the 4 Speed Transmission table about earlier prototype 4.66 transmissions.]

		3788154* (late)	3788155	1st-3.65, 2nd-2.35, 3rd-1.44, 4th-1.00, rev-3.66
		3788154* (late)	3788154 - was the "2nd design" '61 - early '62 4sp. This is the part number given in both the '61 and '62 assembly manuals. It has the 3.65 1st gear. This transmission was originally used for the passenger car only and was then used in the FC also, as reflected in the usage shown in the '61and '62 P&A catalogs.
B	Powerglide	Powerglide transmissions were delivered to the assembly line under a transaxle part number (as a transmission + differential assembly).^¥
		3795640 transaxle assembly (1961 AM); 3788375= transmission (P&A 616-1 12/1960)
^¥Manual transmissions and differentials were shipped directly from their sources to the assembly lines in Flint and St Louis. However, powerglide rear axles from Buffalo went first to Toledo to be mated with powerglide transmissions and converters so that they could be tested and the converter balanced. Only then were the complete assembly units shipped to the assembly lines.
1962 Transmissions
Code	Application	Part #	Case #	Gear ratio, notes, etc.

ST	3 Speed MT^¥	In order to raise the level of the lubrication in the transmission, the lube filler hole was to be moved upward 1" as a running change was implemented in January 1962. The hole diameter also would be increased from ½" to ⁷⁄8". Until modified parts were available, '62 FCs with the 3784344 case would receive a 45^O "L" tube extension (444058) at the fill tube hole (1962 AM, Central Office Advanced Information Notice A.I. 62-13; 3/12/62)
		3826177	3784344	3.50, 1.99, 1.00 rev-3.97
SF	4 Speed MT^¥	See table below for detailed descriptions of 4 speed transmissions
		3788154* early	3788155	3788154 was continued from previous year
		3799363* late	3799364	3799363 superceded 3788154 and was used for the remainder of '62 through '63. (P&A 621A 10/61)
B	Powerglide	As explained for 1961, powerglide transmissions were delivered to the assembly line under a complete transaxle assembly.
		3745640 = transaxle assembly 3788375 = transmission (P&A 34 Oct '62)
^¥Introduced as a mid-1962 change for manual transmissions was the red filler hole plug gasket with the "Trans. Fill Only" message.
1963 Transmissions
Code	Application	Part #	Case #	Gear ratio, notes, etc.
S	3 Speed MT	In light of the mid-'62 change described above, the 1963 AM may be incorrect in showing 3826177 continued from previous year. P&A-10/63 identifies the case as 3826176.
		[3826177-?]	3826176	3.50, 1.99, 1.00 rev-3.97
R	4 Speed MT	See table below for detailed descriptions of 4 speed transmissions
		3799363*	3799364	3799363 continued from previous year (1963 AM; P&A-34 10/62)
B	Powerglide	As explained for 1961, powerglide transmissions were delivered to the assembly line under a complete transaxle assembly
		3745640 = transaxle assembly (1963 AM) 3788375 = transmission;
1964-65 Transmissions
Code	Application	Part #	Case #	Gear ratio, notes, etc.
S	3 Speed MT	3840785	3849447	(1964 AM; P&A-34 10/63)
R	4 Speed MT	Major design changes were implements in 1964 and carried forward for 1965. See table below for detailed descriptions of 4 speed transmissions.
		3837288* early '64	3833192*	3837288 was the "First design ", a modification of #3833191*, the '64 car 4 speed that used a larger diameter 14 spline input shaft. (1964 AM)
		3864460* late '64 - '65	3833192*	3864460 was the "Second design" (1965 AM; P&A-34 10/65)
B	Powerglide	As explained for 1961, powerglide transmissions were delivered to the assembly line under a complete transaxle assembly

1964		3838478 = (transaxle assembly (1964 AM) 3857347 = transmission (P&A-34 10/65)
1965		3857445 = transaxle assembly (1965 AM) 3866774 = transmissio; (P&A-34 10/65)

4 Speed Transmission Component Summary¹
component	Early '61²	Late '61 - Early'62³	Late '62 - '63	Early '64	Late '64 - '65
Transmission part #	3785452	3788154	3799363	3837288	3864460
Case #	3782978	3788155	3799364	3833192
Backup light boss⁴	undrilled	drilled and threaded but plugged			undrilled
Lube drain hole	present			absent
Lube filler hole dia.	1/2"		7/8"
gear ratio	1st-4.26 2nd-2.35 3rd-1.48 4th-1.00 rev-4.27	1st-3.65, 2nd-2.35, 3rd-1.44, 4th-1.00, rev-3.658
Input shaft	3785456 12 splines			3840297 14 splines
Main shaft	3785453		3813663	3852240
Main shaft bearing	907259			907443
Countershaft	3775061 (teeth: 30,27,21,14,15)
Countershaft gear	3784644	6257855		3851512
Clutch gear & synchronizer assy	3785455 (30^o bevel angle)	3814014 (30^o bevel angle)		3840294 (30^o bevel angle)	3851508 (45^o bevel angle)
1st gear (31 teeth)	3775090			3852244⁵
2nd gear	3775093 26 teeth	6257856 28 teeth		3837300⁵ 28 teeth
2nd gear thrst brg	9415297			--	--
1st/2nd synch assy	3780688		3813901⁵
1st/2nd blocking ring	3779482		3813902
3rd gear (22 teeth)	3780252		3821380	3837298
3rd/4th synch assy	3779484		3813904	3794203
3rd/4th blocking ring	3779485		3813905	3849964
reverse idler	3780111			3833198
reverse inhibitor assy	3775070			?	?
Notes 1 - Data was drawn from Assembly Manuals, P&A catalogs (cautiously) Engineering drawings and documents, and other GM documents, as well as Craig Nicol's article on 4-Speed transmissions in the Oct 2003 CORSA Communique, and his separate table of 4 speed transmissions. This reexamination yielded some differences from Nicol's in the inclusion of 3788154 as the FC 4-speed in '61 - '62, and in part numbers in a few places. 2- The Engineering drawings also include two other assemblies with the 4.26 ratio first gear. 3772149* is the earliest drawing of which other assemblies were modifications, including 3785452 and 3772157*, the latter appears to be an early prototype FC 4 speed with a 28-tooth 2nd gear. Only 3785452 was put into production. 3- The rationale for 3788154 is described above in the 1961 transmissions section. 4- A hole for the unused backup light switch was undrilled in 4.26-geared transmissions but drilled and sealed with a "Welch plug" in 3.65 transmissions (although possibly undrilled occasionally; Kirkman, CA 1994 vol 23-1;). The boss was again undrilled in the late version 3864460 transnmissions. 5- In the 1993 Vol 21(#2) issue of CorvanAntics, Bob Helt reported that all of the '64 - '65 4-speed FC transmissions that he had inspected were "hybrids" with late style 3rd and 4th (clutch) gears but with the earlier ('61-'63) 1st and 2nd gear components. Why so was a "mystery".

Differentials (Rear axles) Where to find the ID codes - click images to enlarge Case numbers are on the upper bellhousing cover flange For '61 -'64 differentials, ID codes are on flat retangular boss on lower feft side. For '65 differentials, ID codes are lightly engraved on right side of case . Example late code Example early code In 1964 the lube drain hole (green circle) was eliminated. The red circle is the transmission drain hole. Parts and Accessory catalogs, section 5.505, generally give part numbers for differential cases not the complete differential assemblies. Assembly Manuals give the numbers for either the complete differential (for manual transmssions) or for differential+transmission assemblies (for powerglides). Data here is supplemented with information from other sources, including engineering drawings and documents and other GM documents
1961 Differentials
Code	Application	Carrier	Differential assembly (DA) and/or Transaxle assembly (TA)
BQ	3.27 with MT	3780270	3779576 DA (P&A 616-1 12/60)
BC	3.27 with PG	3780272*	3783257 TA (P&A 616-1 12/60)
	The differential with a 3.27 gear ratio was available only for a while in the beginning of the 1961 model year.
BL	3.89 with MT	3780270	3783095 DA (1961 AM)
BY	3.89 with PG	3780272*	3795640 TA (1961 AM)

1962 Differentials - All 3.89:1 ratio
Code	Application	Carrier	Differential assembly (DA) and/or Transaxle assembly (TA)
HE	MT	3826196* (P&A 34 10/62)	E - 3783095 - DA ('62 AM)
HE	MT	3826196* (P&A 34 10/62)	L- 3826217 - DA ('62 AM)
HF	PG	3780272* (P&A 34 10/62)	3780272 - TA (P&A 621A 10/61)
HL	Posi with MT	3826196*	3826221 - DA (1962 AM)
HM	Posi with PG	3780272*	3826211 - TA (1962 AM)
A mid-1962 model year change was increasing the diameter of the differential filler hole from 1/2" to 3/4" pipe thread. This was done at the same time that the filler hole of the 3-speed MT was elevated an inch and increased to a 7/8" diameter. (1962 AM, Central Office Advanced Information Notice A.I. 62-13; 3/12/62)
1963 Differentials - All 3.89:1 ratio
At least for '63 and '64, differential assemblies were identified with a small metal tab of a specific shape artached under a bolt of the differential cover. Most of these probably are long gone. 1963 coding was as follows: Tag 3741069 - 3.89 axles (HE, HF, HL, HM); Tag 3756491 - 3.55 axles (HB, HJ, HJ and HK) Tag 3741070 - 3.08 axles (HN, HP); no tag - 3.27 axles (HA, HC, HG, HH) (Axle ID Chart 3826800*)
Code	Application	Carrier	Differential assembly (DA) and/or Transaxle assembly (TA)
HE	MT	3826196* (P&A 34 10/62)	3826217 = DA ('63 AM; AIDC)
HF	PG	Early - 3794252*	3795640 = TA ('63 AM)
HF	PG	Late - 3826197* (P&A 34 10/63)	3794236 = DA (AIDC) 3794246 = TA (AIDC)
HL	Posi with MT	3826196* (P&A 34 10/62)	3826221 = DA ('63 AM; AIDC )
HM	Posi with PG	3826197* (P&A 34 10/63)	3794248 = DA (AIDC) 3794240 = TA ('63 AM; AIDC)
Information sources: '63 Assembly Manual (AM), Parts and Accessory (P&A) catalogs, and engineering Axle ID Chart (AIDC)#3826800.
1964 Differentials - All 3.55:1 ratio; carrier with mounting pad for car leaf spring
Code	Application	Carrier	Differential assembly (DA) and/or Transaxle assembly (TA)
HQ	MT	Early -3848104* (P&A 34 10/63), Late - 3856267* (P&A 34 10/65 )	L-3856262= DA ('64 AM; F&P)
HS	PG	3848105* (P&A 34 10/63), ID tag 3741070	3838479= DA (F&P); 3838478 = TA ('64 AM; F&P)
HR	Posi with MT	?	3856265 = DA ('64 AM; F&P)
HT	Posi with PG	?	3838482 = DA (DIDC; F&P) tag 3741070 3838481 = TA ('64 AM; F&P)
Information sources: GM Facilities & Production Planning Department document dated 3-17-1964 (F&P); '64 Assembly manual (AM); Parts and Accessory (P&A) catalogs; engineering Differential ID Chart (DIDC) #3849014. ID tag numbers come from Differential Carrier Assembly chart #3849014
1965 Differentials - All 3.55:1 ratio
Code	Application	Carrier	Differential assembly (DA)and/or Transaxle assembly (TA)
AV	MT	3857450*	3857446 = DA (1965 AM; DCAC2)
AX	PG	3857451*	3857447 = DA (DCAC3); 3857445 =TA (1965 AM)
AW	Posi with MT	3857450*	3864308 = DA ('65 AM)
AY	Posi with PG	3857451*	3864310* = DA (DCAC3)
Is 3864309 a PG or MT differential? The '65 AM says PG, the engineering document for the unit says MT; I have favored the engineering document, and substituted the corresponding PG unit 3864310. Reference also Differential Carrier Assembly Charts 3868792* (DCAC2) and 38687933* (DCAC3).

Distributors & Vacuum Advances Where to find the ID codes - click on image to enlarge Distributor part number is stamped on the body of the unit Vacuum advance code (usually the last three digits of the part number) is stamped on the advance arm.
1961 Distributors
Part #	Application	Vacuum Advance
1110258	Manual Transmission	1116152
1110259	Powerglide	1116177
1962 Distributors
Part #	Application	Vacuum Advance
1110269	Manual Transmission	1116198 (217)
1110271	Powerglide	1116200 (951)
1963 Distributors
Part #	Application	Vacuum Advance
1110294	80HP Manual Transmission	1116199 (217)
1110295	80HP Powerglide	1116200
1110296	102 HP All	1116199
1964 & '65 Distributors
Part #	Application	Vacuum Advance
1110310	95 HP Manual Transmission	1116229
1110311	95 HP Powerglide	1116230
1110319	110 HP All	1116230

Carburetors Where to find the ID codes - click on image to enlarge Carburetor part number and date code are stamped on metal tag. Month of date codes is abbreviated as a letter, where: A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun, G = Jul, H = Aug, J = Sep, K = Oct, L = Nov, M = Dec Year in code is: 1 = 1961, 2 = 1962, 3 = 1963, 4 = 1964, 5 = 1965 Modification sequence in code is: A = 1st, B = 2nd, C = 3rd, etc.
1961 Carburetors
Part #	Application	Jet	Float Setting	Float Drop
7019100	PG (early)	.048	1-7/32	1 3/4
7019101	MT (early)	.049	1-7/32	1 3/4
7019110	PG (late)	.050	1-7/32	1 3/4
7019111	MT(late)	.050	1-7/32	1 3/4
In Canada, 7019111 was used for both MT and PG.
1962 Carburetors
Part #	Application	Jet	Float Setting	Float Drop
7020100	PG	.049	1-7/32	1 3/4
7020101	MT	.050	1-7/32	1 3/4

1963 Carburetors
Part #	Application	Jet	Float Setting	Float Drop
7023100	80HP PG	.049	1-3/16	1 3/4
7023101	80HP MT	.050	1-3/16	1 3/4
7023102	102HP (PG & MT)	.050	1-3/16	1 3/4
1964 Carburetors
Part #	Application	Jet	Float Setting	Float Drop
7024025	95HP MT (PG & MT)	.053	1-1/16	1 13/16
7024024	110HP (PG & MT)	.050	1-3/16	1 3/4

1965 Carburetors
Part #	Application	Jet	Float Setting	Float Drop
7025025	All PG & MT	.053	1-1/16	1 13/16
Although the '65 Assembly manual gives 7024025 as the carburetor for 1965, the P&A catalogs are in close agreement with Bob Helt's book, that 7025025 was the only carburetor used this year.

Cylinder Head Part #s This list is much indebted to Bob Helt's Cylinder head article in the 1993 CORSA Communique 15(9). Where to find the ID codes Cylinder head part numbers are located on the side of the head
1961 Cylinder Heads Cylinder heads lack automatic choke thermostat; have holes for 6 valve cover clamps
Part #	Cast #	Engine	Compr Ratio	Notes
3786583*	3786589*	80 HP	8.0	145 CI
3786584*	3786588*	80 HP	8.0	145 CI
1962 Cylinder Heads Cylinder heads have automatic choke and holes for 4 valve cover clamps
Part #	Cast #	Engine	Compr Ratio	Notes
3817566*	3817568*	80 HP	8.0
3786585*	3786590*	80 HP	?	145 CI, also Low compression export - 6 clamps
3786586*	3786591*	80 HP	?	145 CI, also Low compression export comb chamber
3786957*	3786590*	80 HP	?	145 CI, also Low compression export comb chamber
1963 Cylinder Heads
Part #	Cast #	Engine	Compr Ratio	Notes
3817566*	3817568*	80 HP	8.0	145 CI
3817567*	3817569*	80 HP	?	145 CI, also low compression export
3813511*	3813516*	COPO 102 HP	8.77 (actual)	145 CI
1964 Cylinder Heads
Part #	Cast #	Engine	Compr Ratio	Notes Bob Kirkman only identifies the 1st design heads. However, P&A 34, Oct 1965, includes both 1st and 2nd design heads for '64, as shown here.
3839886*	3839887*	95 HP	?	95 HP "1st design" 164 CI
3819875*	3819876*	110 HP	9.0	110 HP "1st design" 164 CI
3856625	3856626*	95 HP	?	95 HP "2nd design" 164 CI
3856631*	3856632*	110 HP	9.0	110 HP "2nd design" 164 CI
1965 Cylinder Heads
Part #	Cast #	Engine	Compr Ratio	Notes
3856757	3856743	95 HP	8.3	164 CI
3856758	3856759	110 HP	9.3	164CI

Generators and Regulators (Alternators in '65) Where to find the ID codes - click on image to enlarge Generator part number and date code are stamped on the red Delco-Remy tag. Regulator part number is stamped on mounting bracket. Alternator part number and date code are stamped on the alternator housing. In the date code, the Year is: 1 = 1961, 2 = 1962, 3 = 1963, 4 = 1964, 5 = 1965 followed by the month, which is abbreviated as a letter: A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun, G = Jul, H = Aug, J = Sep, K = Oct, L = Nov, M = Dec which is followed by the day.
1961-63 Generators & Regulators
Generator Part #	Amps	stock/option	Regulator
1102227	30A	stock	1119001
1105135	35A L.C.I.	FAO 650 / RPO K71	'61: 1119635* '62-'63: 1119604
The 35 Amp LCI generator was intended for FCs that had a high current demand, such as ambulances, emergency vans and other service vehicles. LCI stands for "Low Cut-In". Generator cut-in is often defined as the speed at which the generator produces a voltage equal to that of the fully charged battery. The specifications show that the 5135 unit could produce 14 Volts (and 35 Amp) at 1730 RPM, versus 2230 RPM (and 30 Amp) for the stock generator. In order to produce higher current at lower RPM, a larger generator with more armature windings is needed, and this is well reflected in the substantial weight of the 5135.
1964 Generators & Regulators
Generator Part #	Amps	stock/option	Regulator
1102336	35A	stock	1119305*
1105135	35A L.C.I.	RPO K71	1119604

1965 Alternators & Regulators
Generator Part #	Amps	stock/option	Regulator
1100639	37A	stock	1119515*
1100698	47A	RPO K84	1119519