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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 |
Metro 1275, '89 on |
99HE38/39, 8.3 CR
99HE35/67/68/69/70/76/94, 9.6 CR |
12HE24,35,39,40,41/42/67-75, 8.0 CR
12HE24/25/48/71/72/73, 9.1 CR
12HF, 10.0 CR |
Information supplied courtesy of the IME .
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