MSE6 - POST 1992 Unleaded Stag
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow.
MSE6 - POST 1992 unleaded stage 2 (Road Rocket) large-bore head
Part No Applications: MSE6, TAM1059, TAM1061, TAM2069, 12G1963, 12G1015, ADU4905
Inlet Valves: 35.6mm(1.401") dia. Original equipment type P/No. TAM1059
Exhaust Valves: 29.2mm(1.150") dia. Original equipment type P/No. TAM1061
Exhaust seats: Latest type Beryllium-based for lead-free fuel P/No. TAM2069
Valve Guides: AE Hepolite cast iron P/No. 12G1963
Valve Springs: Nominal 140lb. Max actual valve lift 0.400" P/No. 12G1015
Stem Seals : Latest 'top-hat' design with tensioner springs (inlets) P/No. ADU4905
Chamber Volume: Nominal 20cc
Combustion chamber volume used to give slight static compression ratio increase over
MSE6 - POST 1992 Unleaded Stag
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation. Three-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow.
MSE6 - POST 1992 unleaded stage 2 (Road Rocket) large-bore head
Part No Applications: MSE6, TAM1059, TAM1061, TAM2069, 12G1963, 12G1015, ADU4905
Inlet Valves: 35.6mm(1.401") dia. Original equipment type P/No. TAM1059
Exhaust Valves: 29.2mm(1.150") dia. Original equipment type P/No. TAM1061
Exhaust seats: Latest type Beryllium-based for lead-free fuel P/No. TAM2069
Valve Guides: AE Hepolite cast iron P/No. 12G1963
Valve Springs: Nominal 140lb. Max actual valve lift 0.400" P/No. 12G1015
Stem Seals : Latest 'top-hat' design with tensioner springs (inlets) P/No. ADU4905
Chamber Volume: Nominal 20cc
Combustion chamber volume used to give slight static compression ratio increase over
MSE4 - Post 1992
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation.
MSE4 - POST 1992 unleaded stage 2 (Road Rocket) large-bore head
Part No Applications: MSE4, C-AEG544, C-AEG106, TAM2069, C-AJJ4037, C-AEA526, ADU4905
Inlet Valves: 35.6mm(1.401") dia. Tuftrided EN214N s/steel P/No. C-AEG544
Exhaust Valves: 29.5mm(1.161") dia. Tuftrided EN214N s/steel P/No. C-AEG106
Exhaust seats: Latest type Beryllium-based for lead-free fuel P/No. TAM2069
Valve Guides: Magnesium bronze P/No. C-AEA526
Valve Springs: Nominal 180lb. Max actually valve lift 0.500" P/No. C-AJJ4037
Stem Seals: Latest 'top-hat' design with tensioner springs (inlets) P/No. ADU4905
Chamber Volume: Nominal 20cc
Three-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish).
MSE4 - Post 1992
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation.
MSE4 - POST 1992 unleaded stage 2 (Road Rocket) large-bore head
Part No Applications: MSE4, C-AEG544, C-AEG106, TAM2069, C-AJJ4037, C-AEA526, ADU4905
Inlet Valves: 35.6mm(1.401") dia. Tuftrided EN214N s/steel P/No. C-AEG544
Exhaust Valves: 29.5mm(1.161") dia. Tuftrided EN214N s/steel P/No. C-AEG106
Exhaust seats: Latest type Beryllium-based for lead-free fuel P/No. TAM2069
Valve Guides: Magnesium bronze P/No. C-AEA526
Valve Springs: Nominal 180lb. Max actually valve lift 0.500" P/No. C-AJJ4037
Stem Seals: Latest 'top-hat' design with tensioner springs (inlets) P/No. ADU4905
Chamber Volume: Nominal 20cc
Three-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish).
MSE3 -Pre 1992
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Stone-ground finish in ports promotes ultimate fuel atomisation.
MSE3 - PRE 1992 unleaded Stage 2 (Road Rocket) large-bore head
Part No Applications: MSE3, C-AEG544, C-AEG106, TAM2069, C-AJJ4037, C-AEA526, ADU4905
Inlet Valves 35.6mm(1.401") dia. Tuftrided EN214N s/steel P/No. C-AEG544
Exhaust Valves 29.5mm(1.161") dia. Tuftrided EN214N s/steel P/No. C-AEG106
Exhaust seats Latest type Beryllium-based for lead-free fuel P/No. TAM2069
Valve Guides Magnesium bronze P/No. C-AJJ4037
Valve Springs Nominal 180lb. Max actually valve lift 0.500" P/No. C-AEA526
Stem Seals Latest 'top-hat' design with tensioner springs (inlets) P/No. ADU4905
Chamber Volume Nominal 20cc
Engine - Identification Data Updated
If you have the engine tag still attached to the engine - just in front/below the thermostat housing - or perhaps the original engine number in the log book then the following should help you determine which engine you have.
For Metro units, see 'Engine - Metro identification data'.
Original engine identification numbers
850cc
8A Austin up to 25000
8MB Morris up to 25000
8AM Austin & Morris 25000 onwards
8AH Austin & Morris Automatic
8AJ Austin & Morris closed circuit breathing
8AK Austin & Morris automatic with closed circuit breathing
8WR Wolseley Hornet & Riley Elf
8AC Moke
85H/101 All variants 1969 onwards
Note: third suffix letter denotes compression type, L = Low, H = High, e.g. 8AM/U/H101 denotes high compression.
998cc
9WR Wolseley Hornet & Riley Elf Mk2, pre closed circuit breathing
9AD Austin, Wolseley Hornet & Riley Elf Mk2 with remote type gearbox and closed
Cylinder head - Identification by casting number
A+ head castings - despite having the same 12G940 casting number - are considerably different in appearance, loosing the flat area behind the thermostat housing and around the rest of the rocker/head stud areas to a sculptured look - where these areas are replaced by a 'sunken' cast finish.
The A+ castings were introduced with the appearance of the Metro in 1980, although some late 1275GTs (1979-on) had them fitted. Generally they are easily recognised by their colour - a putrid yellow on the small-bore castings and bright red on the large-bore ones, a paint finish that is VERY difficult to remove, even in a chemical tank.
The MG See bottom for useful part numbers.
Now this may not be super-sonic speed-inducing power, it could just as well be for maximum economy. In either case, it's the engines volumetric efficiency (VE) under scrutiny - it's ability to breath in as much correctly proportioned air/fuel mix as possible in any given situation.
Engine - Identification data
If you have the engine tag still attached to the engine - just in front/below the thermostat housing - or perhaps the original engine number in the log book then the following should help you determine which engine you have. For Metro units, see 'Engine - Metro identification data'.
Original engine identification numbers
850cc
8A Austin up to 25000
8MB Morris up to 25000
8AM Austin & Morris 25000 onwards
8AH Austin & Morris Automatic
8AJ Austin & Morris closed circuit breathing
8AK Austin & Morris automatic with closed circuit breathing
8WR Wolseley Hornet & Riley Elf
8AC Moke
85H/101 All variants 1969 onwards
Note: third suffix letter denotes compression type, L = Low, H = High, e.g. 8AM/U/H101 denotes high compression.
C-AHT136 - TPi BUDGET UNLEADED STAGE 2
(ROAD ROCKET) LARGE-BORE HEAD.
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished to minimise drag. Multi-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow. Combustion chamber volume used to give slight static compression ratio increase over standard. Head mods employed greatly increase volumetric efficiency, boosting actual running (dynamic) compression ratio.
C-AHT88 STAGE THREE SPEC SMALL BORE CYLINDER HEAD
Modified to give maximum performance gain for cost. Exhaust seats Latest spec inserts for lead free fuel Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively reworked. Stone-ground finish in ports promotes ultimate fuel atomisation.
C-AHT133 - Pre 1992 BUDGET UNLEADED STAGE 2 (ROAD ROCKET)
Modified to give maximum performance gain for cost.
LARGE-BORE HEAD, 24.5c chambers for large bore motors.
Inlet Valves: 35.6mm(1.401") dia. Original equipment type P/No. TAM1059 Exhaust Valves: 29.2mm(1.150") dia. Original equipment type P/No. TAM1061 Exhaust seats: Latest type Beryllium-based for lead-free fuel P/No. TAM2069 Valve Guides: AE Hepolite cast iron P/No. 12G1963 Valve Springs: Nominal 180lb. Max actual valve lift 0.400" P/No. C-AEA526 Stem Seals: Latest 'top-hat' design with tensioner springs (inlets) P/No. ADU4905
Chamber Volume: Nominal 21cc Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished - to minimise drag. Multi-angle valve...
C-AHT135 - Pre 1992 BUDGET UNLEADED STAGE 2 (ROAD ROCKET) LARGE-BORE HEAD.
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished - to minimise drag. Multi-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow. Combustion chamber volume used to give slight static compression ratio increase over standard. Head mods employed greatly increase volumetric efficiency, boosting actual running (dynamic) compression ratio.
MSE3 - PRE 1992 UNLEADED STAGE 2 (ROAD ROCKET) LARGE-BORE HEAD.
Modified to give maximum performance gain for cost.
Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished to minimise drag. Multi-angle valve seats in head.
MSE4 - POST 1992 UNLEADED STAGE 2 (ROAD ROCKET) LARGE-BORE HEAD.
Modified to give maximum performance gain for cost.
Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished to minimise drag. Multi-angle valve seats in head.Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish).
MSE5 - PRE 1992 UNLEADED STAGE 2 (ROAD ROCKET) LARGE-BORE HEAD.
Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished to minimise drag. Multi-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish). Combustion chamber volume used to give slight static compression ratio increase over standard. Head mods employed greatly increase volumetric efficiency
MSE6 - POST 1992 BUDGET UNLEADED STAGE 2 (ROAD ROCKET) LARGE-BORE HEAD.
Modified to give maximum performance gain for cost.
Inlet Valves: 35.6mm(1.401") dia. TAM1059
Exhaust Valves: 29.2mm(1.150") dia. TAM1061
Chamber Volume: Nominal 21cc Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished to minimise drag. Multi-angle valve seats in head. Super-quality MG Metro valves modified to increase airflow. Combustion chamber volume used to give slight static compression ratio increase over standard. Head mods employed greatly increase volumetric efficiency...
MSE7 - TPi UNLEADED STAGE 3 (ROAD ROCKET) LARGE-BORE HEAD.
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished to minimise drag. Multi-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish). Combustion chamber volume used to maintain standard static compression ratio because head mods employed greatly increase volumetric efficiency, boosting actual running (dynamic) compression ratio.
MSE9 - PRE 1992 UNLEADED STAGE 2 (ROAD ROCKET) LARGE-BORE HEAD,
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively re-worked. Smoothed finish in ports - not mirror-finish polished to minimise drag. Multi-angle valve seats in head. Cooper S size valves with current maximum flow profiles and Tuftrided for durability/longevity when used with unleaded fuel (hence 'black' finish). Combustion chamber volume used to give slight static compression ratio increase over standard. Head mods employed greatly increase volumetric efficiency, boosting actual running (dynamic) compression ratio.
C-AHT135 STAGE TWO SPEC BUDGET LARGE BORE CYLINDER HEAD
Modified to give maximum performance gain for cost. Combustion chambers, inlet and exhaust ports extensively reworked. Stone-ground finish in ports promotes ultimate atomisation. Three angle valve seats in head. Standard Cooper ‘S’ size valves used. Combustion chamber volume used to boost standard compression ratio slightly for given application. Head mods applied greatly increase Volumetric efficiency, boosting actual working compression ratio. Compression ratio needs to be increased on lower compression engines where modified cam is used to maximise potential. Seek advice on what is needed.
Before fitting to engine, ensure block and head mating surfaces are thoroughly cleaned. If fitting to a new/re-machined block...
MINI ENGINE STABILISER MSSK1000
1. This is an auxiliary steady bar kit and should not be used to replace any other standard fitment parts that have broken.
2. Remove the radiator support bracket from the radiator and the thermostat housing.
3. Slacken the nut retaining the exhaust manifold at the radiator end of the engine.
4. Remove the three bolts securing the bulkhead blanking plate as shown in the diagram. If the car has a heater pipe as indicated on the diagram then this should be disconnected at the engine.
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