Cylinder head - 998 and 1098cc

Part No: 2A150C
  In Stock
Rocker Cover Chrome Nut
2 points earn (£0.02)
£2.52 inc VAT
£2.10 ex VAT
Part No: LWZ205
  In Stock
WASHER-SPRING, 5/16''
Required Quantity: 4
£0.37 inc VAT
£0.31 ex VAT
Part No: FNZ104
  In Stock
NUT - 1/4" UNF
Required Quantity: 2
£0.35 inc VAT
£0.29 ex VAT
Part No: FNZ105
  In Stock
NUT - 5/16" UNF
Required Quantity: 6
£0.35 inc VAT
£0.29 ex VAT
Part No: PWZ105
  In Stock
WASHER - PLAIN - 5/16"
Required Quantity: 3
£0.20 inc VAT
£0.17 ex VAT
Part No: 2A150
  In Stock
1 points earn (£0.01)
£2.34 inc VAT
£1.95 ex VAT
Part No: 12A1358
  In Stock
 
£0.78 inc VAT
£0.65 ex VAT
Part No: PWZ106
  In Stock
WASHER- PLAIN 3/8 ID SMALL OD
Required Quantity: 9
£0.25 inc VAT
£0.21 ex VAT
Part No: LWZ304
  No Longer Available
USE: LWZ204
Required Quantity: 2
£0.00 inc VAT
£0.00 ex VAT
Part No: CAM4126
  In Stock
 
6 points earn (£0.06)
£7.74 inc VAT
£6.45 ex VAT
Part No: 3H2963
  In Stock
CLIP-HOSE 3/4'' STEEL BAND TYPE
Required Quantity: As Required
1 points earn (£0.01)
£1.50 inc VAT
£1.25 ex VAT
Part No: 12G2534
  In Stock
6 points earn (£0.06)
£8.34 inc VAT
£6.95 ex VAT
Part No: TAM1368
  In Stock
£0.47 inc VAT
£0.39 ex VAT
Part No: ADP210
  In Stock
3 points earn (£0.03)
£4.08 inc VAT
£3.40 ex VAT
Part No: 1B3664
  In Stock
£0.25 inc VAT
£0.21 ex VAT
Part No: 51K885
  In Stock
1 points earn (£0.01)
£1.33 inc VAT
£1.11 ex VAT
Part No: 53K402
  In Stock
1 points earn (£0.01)
£1.66 inc VAT
£1.38 ex VAT
Part No: GTG101
  In Stock
GASKET-THERMOSTAT HOUSING- CORK
Required Quantity: 1/2
1 points earn (£0.01)
£1.56 inc VAT
£1.30 ex VAT
Part No: 88G221B
  In Stock
£0.71 inc VAT
£0.59 ex VAT
Part No: 12A2075
  In Stock
5 points earn (£0.05)
£6.60 inc VAT
£5.50 ex VAT
Part No: 12A1211
  In Stock
£0.90 inc VAT
£0.75 ex VAT
Part No: 12A1215
  In Stock
5 points earn (£0.05)
£7.14 inc VAT
£5.95 ex VAT
Part No: 12A1530
  No Longer Available
USE: LDR10074
Required Quantity: 1
£0.00 inc VAT
£0.00 ex VAT
Part No: 12A186
  In Stock
1 points earn (£0.01)
£2.38 inc VAT
£1.98 ex VAT
Part No: 12A186010
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 12A1950
  In Stock
ROCKER SHAFT-STANDARD
Required Quantity: 1
9 points earn (£0.09)
£11.40 inc VAT
£9.50 ex VAT
Part No: 12A1968
  Awaiting Stock - On Order
4 points earn (£0.04)
£5.94 inc VAT
£4.95 ex VAT
Part No: 12A1987
  In Stock
3 points earn (£0.03)
£4.61 inc VAT
£3.84 ex VAT
Part No: 12A392
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 12A402
  In Stock
5 points earn (£0.05)
£6.84 inc VAT
£5.70 ex VAT
Part No: 12A403
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 12A475
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 12G1015
  In Stock
1 points earn (£0.01)
£1.98 inc VAT
£1.65 ex VAT
Part No: 12G1111
  In Stock
1 points earn (£0.01)
£1.63 inc VAT
£1.36 ex VAT
Part No: 12G1111010
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 12G1221
  In Stock
7 points earn (£0.07)
£9.10 inc VAT
£7.58 ex VAT
Part No: 12G1454
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 12G1926
  Currently Unavailable
9 points earn (£0.09)
£10.98 inc VAT
£9.15 ex VAT
Part No: 12G1927
  In Stock
16 points earn (£0.16)
£19.20 inc VAT
£16.00 ex VAT
Part No: 12G296
  Awaiting Stock - On Order
3 points earn (£0.03)
£4.44 inc VAT
£3.70 ex VAT
Part No: 12G3034
  In Stock
4 points earn (£0.04)
£5.40 inc VAT
£4.50 ex VAT
Part No: 12G3035
  No Longer Available
USE: 12A1987
Required Quantity: 4
£0.00 inc VAT
£0.00 ex VAT
Part No: 12G3036
  In Stock
5 points earn (£0.05)
£6.90 inc VAT
£5.75 ex VAT
Part No: 12G4287
  No Longer Available
USE: AEA311
Required Quantity: 8
£0.00 inc VAT
£0.00 ex VAT
Part No: 12G679
  In Stock
 
1 points earn (£0.01)
£1.62 inc VAT
£1.35 ex VAT
Part No: 12G687
  In Stock
SPACER-CHROME-ROCKER COVER
Required Quantity: 2
 
1 points earn (£0.01)
£2.02 inc VAT
£1.68 ex VAT
Part No: 12H3376
  In Stock
2 points earn (£0.02)
£2.88 inc VAT
£2.40 ex VAT
Part No: 13H2296
  In Stock
3 points earn (£0.03)
£4.56 inc VAT
£3.80 ex VAT
Part No: 1A2156
  In Stock
WASHER-CUP-ROCKER COVER
Required Quantity: 2
£0.86 inc VAT
£0.72 ex VAT
Part No: 1B2925
  In Stock
SPACER-ROCKER COVER BOLT
Required Quantity: 2
£1.15 inc VAT
£0.96 ex VAT
Part No: 2A11
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 2A12
  In Stock
CIRCLIP-VALVE COLLET-'59-'69
Required Quantity: 8
£1.14 inc VAT
£0.95 ex VAT
Part No: 2A18
  In Stock
£0.59 inc VAT
£0.49 ex VAT
Part No: 2A180
  In Stock
3 points earn (£0.03)
£4.20 inc VAT
£3.50 ex VAT
Part No: 2A21
  In Stock
BUSH-ROCKER-STANDARD
Required Quantity: 8
1 points earn (£0.01)
£1.91 inc VAT
£1.59 ex VAT
Part No: 2A243
  No Longer Available
USE: 12A2075
Required Quantity: 1
£0.00 inc VAT
£0.00 ex VAT
Part No: 2A258
  In Stock
1 points earn (£0.01)
£1.98 inc VAT
£1.65 ex VAT
Part No: 2A259
  Available to Customer Order
2 points earn (£0.02)
£3.48 inc VAT
£2.90 ex VAT
Part No: 2A515
  No Longer Available
USE: 2A259
Required Quantity: 1
£0.00 inc VAT
£0.00 ex VAT
Part No: 2A545
  No Longer Available
SHROUD-VALVE GUIDE-'59-'69
Required Quantity: 8
£0.00 inc VAT
£0.00 ex VAT
Part No: 2A639
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 2A640
  In Stock
 
3 points earn (£0.03)
£4.32 inc VAT
£3.60 ex VAT
Part No: 2A877
  In Stock
3 points earn (£0.03)
£4.32 inc VAT
£3.60 ex VAT
Part No: 2A879
  In Stock
SEAL-VALVE STEM 'O' RING TYPE
Required Quantity: 8
£1.08 inc VAT
£0.90 ex VAT
Part No: 2A964
  No Longer Available
ROCKER-PRESSED STEEL TYPE
Required Quantity: 8
£0.00 inc VAT
£0.00 ex VAT
Part No: 2K1345
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 2K4608
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 51K1177
  In Stock
1 points earn (£0.01)
£1.51 inc VAT
£1.26 ex VAT
Part No: 51K1178
  In Stock
£0.37 inc VAT
£0.31 ex VAT
Part No: 51K1193
  In Stock
£1.08 inc VAT
£0.90 ex VAT
Part No: 51K1473
  No Longer Available
USE: CHS522
Required Quantity: 2
£0.00 inc VAT
£0.00 ex VAT
Part No: 53K487
  In Stock
£1.13 inc VAT
£0.94 ex VAT
Part No: 5C2436
  No Longer Available
RIVET-BUSH TO ROCKER
Required Quantity: 8
£0.00 inc VAT
£0.00 ex VAT
Part No: 6K555
  In Stock
£0.90 inc VAT
£0.75 ex VAT
Part No: 6K556
  In Stock
SPRING-ROCKER SPACING
Required Quantity: 3
1 points earn (£0.01)
£1.44 inc VAT
£1.20 ex VAT
Part No: 6K654
  In Stock
£0.91 inc VAT
£0.76 ex VAT
Part No: 6K808
  No Longer Available
PLUG-OIL HOLE-CYLINDER HEAD
Required Quantity: 1
£0.00 inc VAT
£0.00 ex VAT
Part No: 6K878
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: 88G459
  In Stock
2 points earn (£0.02)
£3.16 inc VAT
£2.63 ex VAT
Part No: 88G616
  In Stock
2 points earn (£0.02)
£3.17 inc VAT
£2.64 ex VAT
Part No: 88G617
  In Stock
3 points earn (£0.03)
£4.56 inc VAT
£3.80 ex VAT
Part No: ADU4905
  In Stock
£0.67 inc VAT
£0.56 ex VAT
Part No: AEA311
  In Stock
1 points earn (£0.01)
£1.86 inc VAT
£1.55 ex VAT
Part No: AEA400
  No Longer Available
USE: AEA434
Required Quantity: 4
£0.00 inc VAT
£0.00 ex VAT
Part No: AEA401
  In Stock
1 points earn (£0.01)
£1.80 inc VAT
£1.50 ex VAT
Part No: AEA403
  In Stock
2 points earn (£0.02)
£3.42 inc VAT
£2.85 ex VAT
Part No: AEA434
  In Stock
3 points earn (£0.03)
£4.51 inc VAT
£3.76 ex VAT
Part No: AEA762
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: AEA763
  No Longer Available
USE: TAM2068
Required Quantity: 4
£0.00 inc VAT
£0.00 ex VAT
Part No: AEG167
  In Stock
1 points earn (£0.01)
£1.55 inc VAT
£1.29 ex VAT
Part No: AEG399
  No Longer Available
USE: 12A1950
Required Quantity: 1
£0.00 inc VAT
£0.00 ex VAT
Part No: AHU1897
  In Stock
4 points earn (£0.04)
£5.86 inc VAT
£4.88 ex VAT
Part No: CAM150
  In Stock
3 points earn (£0.03)
£4.22 inc VAT
£3.52 ex VAT
Part No: CAM151
  In Stock
2 points earn (£0.02)
£2.83 inc VAT
£2.36 ex VAT
Part No: CAM289
  In Stock
8 points earn (£0.08)
£10.36 inc VAT
£8.63 ex VAT
Part No: CAM4543
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: CAM4545
  In Stock
NUT-CYLINDER HEAD NUT-'78 ON
Required Quantity: 9
1 points earn (£0.01)
£1.32 inc VAT
£1.10 ex VAT
Part No: CAM6391
  In Stock
3 points earn (£0.03)
£4.56 inc VAT
£3.80 ex VAT
Part No: CAM6502
  No Longer Available
USE: CAM6391
Required Quantity: 4
£0.00 inc VAT
£0.00 ex VAT
Part No: CAM6503
  In Stock
5 points earn (£0.05)
£6.60 inc VAT
£5.50 ex VAT
Part No: CAM6505
  In Stock
5 points earn (£0.05)
£6.80 inc VAT
£5.67 ex VAT
Part No: CAM6520
  No Longer Available
SHIM-VALVE SPRING 848cc '74-'81
Required Quantity: As Required
£0.00 inc VAT
£0.00 ex VAT
Part No: CAM6822
  Awaiting Stock - On Order
 
33 points earn (£0.33)
£40.44 inc VAT
£33.70 ex VAT
Part No: CAM6822FK
  In Stock
9 points earn (£0.09)
£11.94 inc VAT
£9.95 ex VAT
Part No: CAM6823
  In Stock
3 points earn (£0.03)
£3.96 inc VAT
£3.30 ex VAT
Part No: CAM6975
  In Stock
2 points earn (£0.02)
£3.36 inc VAT
£2.80 ex VAT
Part No: CHS2515
  In Stock
STUD-5/16 UNF/UNC x 1 7/8''
Required Quantity: 3
£1.19 inc VAT
£0.99 ex VAT
Part No: CHS2524
  No Longer Available
USE: 51K885
Required Quantity: 3
£0.00 inc VAT
£0.00 ex VAT
Part No: CHS522
  In Stock
1 points earn (£0.01)
£1.54 inc VAT
£1.28 ex VAT
Part No: FHS2518
  In Stock
STUD-5/16 UNF/UNF x 2 1/4''
Required Quantity: 3
1 points earn (£0.01)
£1.36 inc VAT
£1.13 ex VAT
Part No: GB126B
  In Stock
 
£0.62 inc VAT
£0.52 ex VAT
Part No: GEG101SM
  In Stock
12 points earn (£0.12)
£15.54 inc VAT
£12.95 ex VAT
Part No: GEG401
  In Stock
GASKET- ROCKER COVER-CORK
Required Quantity: 1
1 points earn (£0.01)
£1.74 inc VAT
£1.45 ex VAT
Part No: GFE6007
  In Stock
5 points earn (£0.05)
£7.14 inc VAT
£5.95 ex VAT
Part No: GHF261
  In Stock
£0.80 inc VAT
£0.67 ex VAT
Part No: GUG2506C
  In Stock
 
7 points earn (£0.07)
£9.00 inc VAT
£7.50 ex VAT
Part No: GUG704053MG
  In Stock
 
1 points earn (£0.01)
£1.44 inc VAT
£1.20 ex VAT
Part No: GUG705558
  In Stock
GASKET-THERMOSTAT HOUSING, PAPER
Required Quantity: 1/2
1 points earn (£0.01)
£1.55 inc VAT
£1.29 ex VAT
Part No: NH605040
  In Stock
NUT-5/16 UNF NATURAL FINISH
Required Quantity: 4
£0.38 inc VAT
£0.32 ex VAT
Part No: NT605061
  No Longer Available
USE: 51K1178
Required Quantity: 8
£0.00 inc VAT
£0.00 ex VAT
Part No: RU612123
  In Stock
£1.14 inc VAT
£0.95 ex VAT
Part No: TAM1062
  In Stock
4 points earn (£0.04)
£5.52 inc VAT
£4.60 ex VAT
Part No: TAM1770
  In Stock
4 points earn (£0.04)
£5.64 inc VAT
£4.70 ex VAT
Part No: TAM2068
  In Stock
 
4 points earn (£0.04)
£5.22 inc VAT
£4.35 ex VAT
Part No: TAM2152
  No Longer Available
 
£0.00 inc VAT
£0.00 ex VAT
Part No: ZPS314
  In Stock
£0.18 inc VAT
£0.15 ex VAT
998 and 1098cc Cylinder Head Identification    
Cylinder head details in this section are appropriate for the 998cc engine used in Minis between 1963 and 1992 (including Riley Elf, Wolseley Hornet and Cooper 
models) and the 1098cc engine used in Minis between 1975 and 1981.      
         
The cylinder head design for the standard tune 998cc Mini engine was shared with the 848cc engine, but not the 998cc Cooper unit. It was also shared with 
other BMC model engines, including 803 and 948cc units to be found in Morris Minors, Austin A30, A35 and A40 models and the 'Frogeye' Austin Healey Sprite 
Mk I.  Only the castings marked 2A628 (usually earlier A Series), 12A1456 (later A Series), CAM4005 (air injection type) and CAM4180 (A Plus, 1981 on) are 
appropriate for the standard tune 998cc Mini - the outwardly similar 2A629 is not.  The other obvious distinguishing feature of this cylinder head is the inlet valve
diameter, which at just 1 1/16" (27mm) is the smallest of any A Series head design.    
         
The 998cc Cooper cylinder head was also fitted to high performance 1098cc engines, including the MG, Wolseley, Riley Kestrel and Vanden Plas Princess 
1100 models, plus 1098cc Austin Healey Sprites and MG Midgets.  For identification purposes the casting number is 12G206 (only on the earliest produced heads) 
or 12G295 (on the vast majority), while inlet valves are 5/32" larger than on the standard 998cc head at 1 7/32" (31mm) diameter.  As far as flow characteristics are
concerned, the number 12G295 is writ large in Mini tuners' folklore.  It is wholeheartedly recommended for uprated small bore A Series engines for any application 
other than full race.      
         
The Mini 1098cc cylinder head design also saw use on several other engines including the single carburetter Austin/Morris 1100, the 948cc Austin Healey Sprite 
Mk II and MG Midget Mk I and the earliest incarnation of the Mini Cooper, the 997cc model.  For identification purposes the casting number is 12G202 and inlet 
valves are 1 5/32" (29.4mm) diameter.    
         
At various times during A Series engine production, new and reconditioned cylinder heads from the factory were either in 'assembly' or 'bare' condition.  
Assemblies usually included studs, valves, valve springs and guides (but not rockers, rocker shaft and pedestals) whereas bare heads usually included valve guides 
and studs only.  These states of build were however not hard and fast, so if you are offered a new or reconditioned factory cylinder head on an exchange unit 
scheme you should establish before ordering exactly what you will receive, to guard against the possibility of giving away components on your old head that you 
will still need in future!        
         
Rebuilt or Repaired 998 and 1098cc Cylinder Heads    
Somerford Mini Ltd. offers a bespoke cylinder head rebuilding and repair service.  In our experience, a large number of customers require some degree of modification
to their cylinder heads and as a result, whether you want a standard head or one that is uprated to any degree, we ask you to contact us to discuss your requirements.
It would be helpful if you could also supply us with the details of your engine: full engine number (if known) and type (capacity, high or low compression, gearbox,
breathing system, etc.), plus any existing modifications.  The more you can provide us with, the better we can help you.  All of our cylinder heads are built to 
run on lead-free fuel, unless you specify otherwise.    
Ill. No. Part No. Description Qty. Rqd. Remarks
1      - CYLINDER HEAD ASS'Y, with valves 1 998cc 1963-80 (not Cooper); please contact us for details.
    (2A628 or 12A1456 casting number)    
       - CYLINDER HEAD ASS'Y, with valves 1 998cc 1975-80 (Canada and Sweden); please contact us for details.
    (12A1456 or CAM4005 casting, with air ports)    
       - CYLINDER HEAD ASS'Y, with valves 1 998cc 1981 on (A Plus); please contact us for details.
    (CAM4180 casting number)    
       - CYLINDER HEAD ASS'Y, with valves 1 998cc (Cooper); please contact us for details.
    (12G206 or 12G295 casting number)    
       - CYLINDER HEAD ASS'Y, with valves 1 1098cc; please contact us for details.
    (12G202 casting number)    
2      - CYLINDER HEAD, bare, with guides and studs only  1 998cc 1963-80 (not Cooper); please contact us for details.
    (2A628 or 12A1456 casting number)    
       - CYLINDER HEAD, bare, with guides and studs only  1 998cc 1975-80 (Canada and Sweden); please contact us for details.
    (12A1456 or CAM4005 casting, with air ports)    
       - CYLINDER HEAD, bare, with guides and studs only  1 998cc 1981 on (A Plus); please contact us for details.
    (CAM4180 casting number)    
       - CYLINDER HEAD, bare, with guides and studs only  1 998cc (Cooper); please contact us for details.
    (12G206 or 12G295 casting number)    
       - CYLINDER HEAD, bare, with guides and studs only  1 1098cc; please contact us for details.
    (12G202 casting number)    
         
Gasket Set      
Ill. No. Part No. Description Qty. Rqd. Remarks
3 GEG101SM GASKET SET, cylinder head 1 See note below.
The cylinder head gasket set, also known as a 'decoke' or 'decarbonising' set, includes the cylinder head gasket, manifold gasket, two thermostat housing gaskets
(one extra to cater for later engines with sandwich plates), six HS2 carburetter gaskets, three HS4 carburetter gaskets, rocker cover gasket and heater valve gasket.  
Valve stem oil seals are not included, leaving customers to choose the type and quantity they need and order them separately.
         
Cylinder Head Components    
Cylinder Head Fixings      
Ill. No. Part No. Description Qty. Rqd. Remarks
4 GUG2506C GASKET, cylinder head, copper 1  
5 CAM150 STUD, cylinder head, long 4  
6 CAM151 STUD, cylinder head, short 5  
7 51K1193 NUT, cylinder head to block 9 1963-78 standard fitment.
8 PWZ106 WASHER, plain 9 1963-78 standard fitment.
  GB126B WASHER, plain 9 Alternative heavy duty washer. Withstands up to 80lbf ft torque.
9 CAM4545 NUT, flanged, cylinder head to block (does not require plain washer) 9 1978 on standard fitment. 1963-78 heavy duty alternative.
         
Plugs and Adaptors      
Ill. No. Part No. Description Qty. Rqd. Remarks
10 2K1345 PLUG, oil hole, cylinder head 1 1963-85; alternative to 6K808.
  6K808 PLUG, oil hole, cylinder head 1 1963-85; alternative to 2K1345.
  RU612123 RIVET, oil hole, cylinder head 1 1985 on.
11A 2A243 ADAPTOR, by-pass hose, short 1 1963-69; use with long by-pass hose.
  12A2075 ADAPTOR, by-pass hose, long 1 1969 on; use with short by-pass hose.
11B CAM4126 PLUG, bypass adaptor blanking A/R Use if thermostat blanking sleeve is fitted.
11C 3H2963 CLIP, bypass blanking plug A/R  
12 12G1454 TUBE, air injection port 4 Canada and Sweden 1975-80.
13 ADP210 PLUG, temperature sender unit boss 1 Models without temperature gauge.
14 1B3664 WASHER, sealing 1 Models without temperature gauge.
         
Thermostat Housing and Fixings    
Ill. No. Part No. Description Qty. Rqd. Remarks
15      - HOUSING, thermostat 1  
For details of thermostat housings, please see the 'Cooling - Thermostats and Water Pumps' section in the Cooling and Heating area of the Somerford Mini catalogue.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
16 GTG101 GASKET, thermostat housing, cork 1/2 Qty. 2 required for Japan 1980 on.
  GUG705558 GASKET, thermostat housing, paper 1/2 Qty. 2 required for Japan 1980 on.
In theory the two gasket materials are interchangeable, but the cork gasket seems to be preferred by Somerford Mini customers for a simple thermostat housing fitment, whereas the later paper gasket is preferred for a thermostat housing with sandwich plate (applicable for Japan 1980 on).  
         
Ill. No. Part No. Description Qty. Rqd. Remarks
17 CHS2515 STUD, thermostat housing 3  
  FHS2518 STUD, thermostat housing 3 Canada and Sweden 1975-80.
  CHS2524 STUD, thermostat housing and sandwich plate 3 Japan 1980 on.
18 FNZ105 NUT 3  
19 PWZ105 WASHER, plain 3  
         
Heater Valve or Tap and Fixings 1963-88    
Ill. No. Part No. Description Qty. Rqd. Remarks
20      - VALVE, heater 1 See note below.
21      - TAP, heater 1 See note below.
For details of the heater valves and taps, please see the 'Heating - Heater Hoses, Water Control Valves and Cables' section in the Cooling area of the Somerford Mini catalogue.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
22 2A180 PLATE, blanking heater take-off in cylinder head 1 For models without heater.
23 88G221B GASKET, heater take-off 1  
24 53K402 STUD, heater take-off  2  
25 FNZ104 NUT 2  
26 LWZ304 WASHER, locking 2  
         
Heater Adaptor and Fixings 1988 On    
Ill. No. Part No. Description Qty. Rqd. Remarks
27 12G2534 ADAPTOR, heater, cylinder head 1  
28 88G221B GASKET, adaptor to cylinder head 1  
29 TAM1368 SCREW, adaptor to cylinder head 2  
         
Manifold Fixings      
Ill. No. Part No. Description Qty. Rqd. Remarks
30 GUG704053MG GASKET, manifold 1  
31 53K487 STUD, manifold 6  
32 12A1211 WASHER, plain, large, clamping manifold 4  
33 PWZ105 WASHER, plain   2  
34 GHF261 NUT, brass, manifold to cylinder head 6  
  51K1177 NUT, brass, manifold to cylinder head, long 6 Alternative; easier to access.
  FNZ105 NUT, steel 6 Alternative.
The steel nut alternative was fitted off and on over the years (most likely as a panic measure when the production line ran out of brass nuts) but does tend to sieze on the manifold studs unless plenty of copper grease is applied. 
         
         
Rocker Cover and Fixings      
Ill. No. Part No. Description Qty. Rqd. Remarks
35 12A475 ROCKER COVER, steel, with breather pipe 1 1963-69 open circuit breathing models.
36 12A1530 ROCKER COVER, steel, without breather pipe 1 1964 on closed circuit breathing models.
  CAM4543 ROCKER COVER, steel, with breather pipe 1 Canada and Sweden 1975-80.
37 CAM6822 ROCKER COVER, alloy, without breather pipe 1 Accessory (also MG Metro) item for closed circuit breathing models.
A range of polished or painted alloy accessory rocker covers is available from Somerford Mini; please contact us for details.  Note that some accessory rocker covers require different fixings from the standard items.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
38      - PLATE, engine name 1 See note below.
       - DECAL, engine name 1 See note below.
       - PLATE, engine patent 1 See note below.
       - DECAL, engine patent 1 See note below.
For details of the large range of plates and decals fixed to rocker covers, please see the 'Chassis Plates and Decals' section in the Interior Body Fittings area of the Somerford Mini catalogue.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
39 12A402 CAP, oil filler, black plastic, without breather 1 1963-69 open circuit breathing models.  
40 13H2296 CAP, oil filler, black plastic, with breather 1 1964 on closed circuit breathing models.
41 GFE6007 CAP, oil filler, red plastic, with breather  1 For CAM6822 alloy rocker cover.
42 12A403 SEAL, plastic oil filler cap 1 For 12A402 and 13H2296 caps.
43 GEG401 GASKET, rocker cover 1  
44 CAM6822FK CHROME FIXINGS KIT, rocker cover 1  
Includes chrome nuts, chrome distance pieces, chrome cup washers and rubber bushes.  For alloy rocker covers such as CAM6822. 
         
Ill. No. Part No. Description Qty. Rqd. Remarks
45 2A150 NUT, rocker cover to engine 2 Original zinc finish.
  2A150C NUT, rocker cover to engine 2 Chrome, for steel rocker covers.
  CAM6823 NUT, rocker cover to engine 2 Chrome, longer, for alloy rocker covers.
46 1B2925 DISTANCE PIECE 2 Original zinc finish.
  12G687 DISTANCE PIECE 2 Alternative chrome finish.
47 1A2156 WASHER, cup 2 Original zinc finish.
  12G679 WASHER, cup 2 Alternative chrome finish.
48 12A1358 BUSH, rubber 2  
49 12A1968 LIFTING EYE, engine, temporary fitment 2 Fit to engine only while lifting work is taking place.
         
Rocker Shaft, Rockers and Fixings    
Ill. No. Part No. Description Qty. Rqd. Remarks
50 12G1926 PEDESTAL, rocker shaft, with oil hole 3  
51 12G1927 PEDESTAL, rocker shaft, with tapped hole 1  
52 2A258 SCREW, locating rocker shaft 1  
53 2A515 PLATE, securing screw 1 1963-74.
54 2A259 PLATE, securing screw 1 1974 on; will fit 1963-74 models.
55 51K885 STUD, long, rocker cover and rocker pedestal 2 Outer pedestals.
56 51K1473 STUD, short, rocker pedestal 2 998cc, inner pedestals.
  CHS522 STUD, short, rocker pedestal 2 1098cc, inner pedestals.
57 NH605040 NUT, pedestal to cylinder head 4  
58 LWZ205 WASHER, locking 4 1963-69.
59 PWZ105 WASHER, plain 3 1969 on.  Not used on tapped pedestal.
60 PWZ106 WASHER, plain 3 1969 on.  Not used on tapped pedestal.
61 AEG399 ROCKER SHAFT ASS'Y 1 1963-74.
62 12A1950 ROCKER SHAFT 1 1974 on; will fit 1963-74 models.
63 6K878 END PLUG, plain 1 Included in AEG399 rocker shaft ass'y.
64 2K4608 END PLUG, screwed 1 Included in AEG399 rocker shaft ass'y.
65 2A964 ROCKER, pressed steel 8 First rocker type.
66 12G1221 ROCKER, forged 8 Second rocker type.
67 CAM289 ROCKER, scintered 8 Third rocker type, 1974 on.
Pressed steel rockers and the stronger forged rockers were used in standard and high performance engines as alternatives both in production and the parts 
department until 1974, when the scintered rocker was introduced.  The scintered rocker was used in all engine production from that time onwards, although 
the pressed steel and forged types continued to be offered as alternative spare parts for earlier cars.  For normal road use it does not matter which type of rocker 
is used, so long as (i) all eight on the rocker shaft are of the same type; (ii) all eight are either the same age from the same engine or are new; and (iii) the tappet 
adjusting screws and nuts are correct for the type of rocker.  Note that the forged rockers have replaceable bushes, whereas the other two designs do not.
         
The pressed steel rocker listed here, 2A964, is the original 'small bore' A Series item; the 'big bore' (1275cc) equivalent listed elsewhere in the Somerford Mini 
catalogue is 12G1313.  The difference in theory between the two is a marginal increase in lift with the 'big bore' rocker, although in practice this is often swallowed 
up by assembly tolerances.  Concerning forged rockers, again originally there were small and big bore engine variants, but since the big bore item is the one 
available (and it works perfectly well on a small bore engine), that's the one we list here.  There were no small or big bore variants of the scintered rocker - one type 
fitted all.        
         
Several designs of high-lift and roller rockers are also available for tuning purposes, along with special valve springs to avoid coil binding, if necessary.  Please 
contact Somerford Mini for details of these and other engine tuning parts.    
         
Ill. No. Part No. Description Qty. Rqd. Remarks
68 2A21 BUSH, rocker 8 Included in forged rocker.
69 5C2436 RIVET, bush to rocker 8 Included in forged rocker.
70 12A1215 SCREW, tappet adjusting 8 Use with pressed steel rocker.
71 6K654 NUT, locking screw 8 Use with pressed steel rocker.
72 AEG167 SCREW, tappet adjusting 8 Use with forged rocker.
73 NT605061 NUT, locking screw 8 Use with forged rocker.
74 12H3376 SCREW, tappet adjusting 8 Use with scintered rocker.
75 51K1178 NUT, locking screw 8 Use with scintered rocker.
76 6K556 SPRING, rocker spacing 3  
77 2A18 WASHER, double coil, outer ends of shaft 2  
78 6K555 WASHER, plain, outer ends of shaft 2  
79 ZPS314 SPLIT PIN, outer ends of shaft 2  
         
Valve Guides and Valve Seat Inserts    
Ill. No. Part No. Description Qty. Rqd. Remarks
80 12G1111 GUIDE, inlet and exhaust valve 8 998cc (not Cooper); standard size.
  12G1111010 GUIDE, inlet and exhaust valve 8 998cc (not Cooper); 0.010" oversize.
  12A186 GUIDE, inlet and exhaust valve 8 998cc (Cooper) and 1098cc; standard size.
  12A186010 GUIDE, inlet and exhaust valve 8 998cc (Cooper) and 1098cc; 0.010" oversize.
81 2A639 INSERT, inlet valve seat 4 998cc standard size.
  AEA762 INSERT, inlet valve seat 4 998cc 1/16" oversize.
  12A392 INSERT, inlet valve seat 4 1098cc.
  TAM2152 INSERT, inlet valve seat 4 Lead free fuel compatible.
82 2A640 INSERT, exhaust valve seat 4 Standard size.
  AEA763 INSERT, exhaust valve seat 4 1/16" oversize; for leaded fuel use.
  TAM2068 INSERT, exhaust valve seat 4 Lead free fuel compatible.
Note that standard size and oversize inserts should not be mixed together on the same cylinder head.  
         
Valves and Valve Springs    
There are three types of collet used to retain valves in place on these engines and four types of valve to take them.  The earlier valve designs 
up to the early 1970s had a groove 1/4" deep into which the collets located, whereas later valves had a groove 1/8" deep, either 7/32" from the valve tip (early 1970s 
to 1980) or 9/64" from the valve tip (the 1981 introduced A Plus type).  Finally came the last variation, from 1984 onwards, where the collet located into an easily 
identified triple groove on the valve.  Care must be taken to ensure that valves, valve caps, valve springs and collets are matched before attempting reassembly.  
Note also that while the early large groove collets were originally secured together with circlips, around 1969 these were judged to be adding nothing to the 
security of the collets and were discontinued.    
         
A range of uprated valves, valve springs and caps to suit most uses are also available from Somerford Mini; please contact us for details.
         
998cc (Not Cooper) 1963-74 approx    
Valves With 1/4" Collet Groove    
Ill. No. Part No. Description Qty. Rqd. Remarks
83 2A877 VALVE, inlet, 1 1/16" (27mm) dia. 4  
84 AEA434 VALVE, exhaust, 1" (25.4mm) dia. 4  
85 AEA311 SPRING, valve 8  
86 2A11 SPLIT COLLET, pair, valve retaining 8  
87 2A12 CIRCLIP, valve collet 8 1963-69; no longer fitted.
88 88G616 CAP, upper, valve spring 8  
89 2A879 OIL SEAL, valve stem 8  
90 2A545 SHROUD, valve guide 8 1963-69.
         
998cc (Cooper) 1963-69       
Original Valves With 1/4" Collet Groove    
Replacement Valves With 1/8" Collet Groove    
Note that in the event of the original AEA400 exhaust valve not being available, the standard tune 998cc exhaust valve AEA434 may be substituted.  Other replacement valves include 12G3034 and 12G3035 but since these have 1/8" collet grooves, 88G459 collets must be fitted with them.   
Ill. No. Part No. Description Qty. Rqd. Remarks
91 12G296 VALVE, inlet, 1 7/32" (31mm) dia. 4 Original with 1/4" collet groove.
  12G3034 VALVE, inlet, 1 7/32" (31mm) dia. 4 Replacement with 1/8" collet groove.
92 AEA400 VALVE, exhaust, 1" (25.4mm) dia. 4 Original with 1/4" collet groove.
  AEA434 VALVE, exhaust, 1" (25.4mm) dia. 4 Replacement with 1/4" collet groove.
  12G3035 VALVE, exhaust, 1" (25.4mm) dia. 4 Replacement with 1/8" collet groove.
93 AEA311 SPRING, valve, outer 8  
94 AEA401 SPRING, valve, inner 8  
95 2A11 SPLIT COLLET, pair, valve retaining 8 Use with original 1/4" groove valves.
  88G459 SPLIT COLLET, pair, valve retaining 8 Use with replacement 1/8" groove valves.
96 2A12 CIRCLIP, valve collet 8 1963-69; no longer fitted.
97 88G616 CAP, upper, valve springs 8  
98 AEA403 COLLAR, lower, valve springs 8  
99 2A879 OIL SEAL, valve stem 8  
         
998cc 1974 approx. to 1981      
Valves With 1/8" Collet Groove, 7/32" From Valve Tip    
Ill. No. Part No. Description Qty. Rqd. Remarks
100 CAM6391 VALVE, inlet, 1 1/16" (27mm) dia. 4  
101 12A1987 VALVE, exhaust, 1" (25.4mm) dia. 4  
102 AEA311 SPRING, valve 8  
103 88G459 SPLIT COLLET, pair, valve retaining 8  
104 88G616 CAP, upper, valve spring 8  
105 2A879 OIL SEAL, valve stem 8 Not originally specified - fit if desired.
106 CAM6520 SHIM, valve spring A/R  
         
1098cc 1975-81      
Valves With 1/8" Collet Groove, 7/32" From Valve Tip    
Ill. No. Part No. Description Qty. Rqd. Remarks
107 12G3036 VALVE, inlet, 1 5/32" (29.4mm) dia. 4  
108 12A1987 VALVE, exhaust, 1" (25.4mm) dia. 4  
109 12G4287 SPRING, valve 8  
110 88G459 SPLIT COLLET, pair, valve retaining 8  
111 88G616 CAP, upper, valve spring 8  
112 2A879 OIL SEAL, valve stem 8 Not originally specified - fit if desired.
         
998cc 1981-84      
Valves With 1/8" Collet Groove, 9/64" From Valve Tip (A Plus Type)    
Ill. No. Part No. Description Qty. Rqd. Remarks
113 CAM6502 VALVE, inlet, 1 1/16" (27mm) dia. 4  
114 CAM6503 VALVE, exhaust, 1" (25.4mm) dia. 4  
  CAM6505 VALVE, exhaust, 1" (25.4mm) dia., chrome stem 4 Lead free fuel compatible.
115 12G1015 SPRING, valve 8 High (10.3:1) compression ratio engines.
  AEA311 SPRING, valve 8 Low (8.3:1) compression ratio engines.
116 88G459 SPLIT COLLET, pair, valve retaining 8  
117 88G617 CAP, upper, valve spring 8  
118 ADU4905 OIL SEAL, valve stem 4/8  
For a period, engines were fitted with oil seals on the inlet valve stems only, after which all valves wore them.  Opinions differ on which is better - the choice is yours. 
         
998cc 1984 On      
Valves With Triple Collet Groove (A Plus Type)    
Ill. No. Part No. Description Qty. Rqd. Remarks
119 TAM1062 VALVE, inlet, 1 1/16" (27mm) dia. 4 Lead free fuel compatible.
120 TAM1770 VALVE, exhaust, 1" (25.4mm) dia. 4 Lead free fuel compatible.
121 12G1015 SPRING, valve 8 High (10.3:1) compression ratio engines.
  AEA311 SPRING, valve 8 Low (8.3:1) compression ratio engines.
122 CAM6975 SPLIT COLLET, pair, valve retaining 8  
123 AHU1897 CAP, upper, valve spring 8  
124 ADU4905 OIL SEAL, valve stem 8  
View as:
Show items
Items 1 to 12 of 126 total
1 2 3 4 5 6 ...
Part No: ZPS314
  In Stock
£0.18 inc VAT
£0.15 ex VAT
Part No: TAM2152
  No Longer Available
 
£0.00 inc VAT
£0.00 ex VAT
Part No: TAM2068
  In Stock
 
4 points earn (£0.04)
£5.22 inc VAT
£4.35 ex VAT
Part No: TAM1770
  In Stock
4 points earn (£0.04)
£5.64 inc VAT
£4.70 ex VAT
Part No: TAM1062
  In Stock
4 points earn (£0.04)
£5.52 inc VAT
£4.60 ex VAT
Part No: RU612123
  In Stock
£1.14 inc VAT
£0.95 ex VAT
Part No: NT605061
  No Longer Available
£0.00 inc VAT
£0.00 ex VAT
Part No: NH605040
  In Stock
£0.38 inc VAT
£0.32 ex VAT
Part No: GUG705558
  In Stock
1 points earn (£0.01)
£1.55 inc VAT
£1.29 ex VAT
Part No: GUG704053MG
  In Stock
 
1 points earn (£0.01)
£1.44 inc VAT
£1.20 ex VAT
Part No: GUG2506C
  In Stock
 
7 points earn (£0.07)
£9.00 inc VAT
£7.50 ex VAT
Part No: GHF261
  In Stock
£0.80 inc VAT
£0.67 ex VAT
Add to cart
Items 1 to 12 of 126 total
1 2 3 4 5 6 ...
Request a free catalogue