Engine number guide

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Leaded Engines:

850cc engines
8A 850 Austin 34HP until eng.nr. 25000
8MB 850 Morris until eng.nr. 25000
8AM 850 Austin/Morris since nr. 25001
8AH 850 Austin/Morris Automatic
8AJ 850 Austin/Morris with crankcase gas recycling
8AK 850 Austin/Morris Automatic with crankcase gas recycling
8WR 850 Wolseley/ Riley
8AC 850 Moke
85H/101 850 from 1969 on

970cc engines
9F/Sa/X eng nr 29001-29003 with Tecalemit filter
9FD/Sa/X with Tecalemit filter and crankcase vent on carb
9FE/Sa/X same but oil filter with oilpressure switch
9F/Sa/X eng nr 29039-30029 with Purolator-filter with switch & crank case vent on carb

997cc engines
9F/Sa/H Cooper (except engnr. 19201-20410, those were 1071cc)
9F/Sa/L Cooper - Compression of 8.3

998cc engines
9AD same, but remote gear, crank case recycling, 39HP
9AE 998 Wolseley/ Riley MK III
99H/-/101 Wolseley/ Riley, Mini Clubman, Mini 1000 from 1970 on with dished pistons
99H/791 Mini 1000 1974 on with dished pistons
99H/997 A+ block from 1980 on with flat pistons and 2.95 diff
99H/A97P A+ with dished pistons, pre-A+ gears, 3.44 diff and 12" wheels
99H/B81 until eng.nr. 127431 with circlip

998cc A+ engines from 1985 on
Ungrooved lower main bearings, piston with circlip pin. 42 HP

99H/B81 since 127432 without circlip
99H/C20 until eng.nr. 105023 with circlip
99H/C20 since 105024 without circlip
99H/997 since eng. nr. 127422 with 2.9 diff

1071cc
9F/Sa/H eng nr 26501-33660 and 19201-20410
9FD/Sa/H eng nr 33661-33948, oil filter with pressure switch & crank case vent on carb
10F Cooper S

1098cc engines
10AMW/Ta Clubman estate and Austin 1100 45HP
10H791 Clubman 1100
10GR/Ta/H MG1100
10GRB/Ta/H MG1100/Wolseley 1100
10V/Ta/H Vanden Plas 1100

1275cc engines
9F/Sa/Y eng nr 31001-31405, Purolator filter, without crank case vent on carb
9FD/Sa/Y after eng nr 32178, with crank case vent on carb and oil pressure switch
9F/Sa/Y from eng nr 32378 on, Puroalator filter with switch, crank case vent, AEG 510 cam from engnr 40006on, crossdrilled EN40B crank from engnr 42730on
12G/Ta/H Wolseley/Riley/VP 1300 with S-Conrods
12H739 1275GT with electric fuelpump and dynamo, 53HP
12H380 same with alternator and remote gear
12H389 same as 12H379, but mechanic fuel pump
12H390 same as 12H389, but alternator
12H706 same as 12H380, but rod gear change
12H397 Cooper S MK III with dynamo and EN16T crank, 73HP
12H398 Cooper S MK III with alternator
12H/-/ 1275 Allegro, Austion 1300, 53HP
12H610/635 Innocenti Cooper with duplex chain, 64HP
12H719/832 same with simplex chain and tensioner
12H832XH De Tomaso 120L 70HP
12H907 standard 1275 Metro, pre October '84
12H996A MG Metro
12H959aa MG Metro Turbo 93HP

Unleaded Engines:

998cc Unleaded engines ('89 on)
99HD81(P) 998cc A+ from 1989 on: lead free, 422 with 2.9 diff, 41HP
Flat top pistons with press fit gudgeon pins

99HE20/21
99HF15/16/32
99HG30/32/33/34/39
LBB10089
99HE22 998cc A+ from 1989 on: lead free, 422 with 2.9 diff, 41HP
Dished pistons with press fit gudgeon pins

99HG31
LBB10175

1275cc Unleaded engines ('90 on)
12A 2A carburettor
12A 2B carburettor and catalyst
12A 2D TBI single point fuel injection, 9.4 CR
12A 2E TBI single point fuel injection, 10.4 CR
The following letters are additional to 12A numbers:
G01 C/R 10.1:1, 3.11 diff, catalyst, no oil cooler
G03 C/R 9.4:1, 3.11 diff, catalyst, from may 1992 on
G04 C/R 9.4:1, 2.76 diff, cat, french version
G05 C/R 9.4:1, automatic, cat
F53 C/R 10.1:1, 3.11 diff, cat, oil cooler
F75 C/R 9.4:1, 3.11 diff, non open loop cat, injection
F76 C/R 9.4:1, automatic, non open loop cat, injection
F77 C/R 10.1:1, 3.21 diff, non open loopcat, injection
DF Mayfair 1.3i, cat, 53HP

Unleaded Metro Engines

Metro 1000 '89 on
99HE38/39, 8.3 CR
99HE35/67/68/69/70/76/94, 9.6 CR

Metro 1275 '89 on
12HE24,35,39,40,41/42/67-75, 8.0 CR
12HE24/25/48/71/72/73, 9.1 CR
12HF, 10.0 CR