Cylinder head - 1275cc (not cooper s)

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NUT-CYLINDER HEAD NUT-'78 ON
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1275cc Cylinder Head Identification    
Cylinder head details in this section are appropriate for the 1275cc engine used in Mini 1275 GTs between 1969 and 1980, the 'high performance' Mini Cooper 
from 1990 onwards and 'standard performance' Minis from 1992 onwards.  The 'eleven stud' cylinder heads for 1275cc Mini Cooper S engines, built up to 1971, are 
described in the next section of the Somerford Mini catalogue.    
         
The cylinder head design for the non-Cooper S 1275cc Mini engine was shared with many other BMC/Leyland/Austin Rover model engines, but unlike other A
Series cylinder heads it was only ever fitted to the one size of engine.  Thus other cars sharing the cylinder head were all 1275cc models, including the Austin/
Morris 1300 (but not the high performance versions, which used the late Cooper S head), Morris Marina and Ital 1.3, Austin Allegro 1300 and 1.3, Austin Healey 
Sprite Mk IV/MG Midget Mk III, Austin/MG Metro, Austin Maestro and Montego.  The number cast into the cylinder head is 12G940, but note that there are several 
versions of cylinder head identified by this number, which means that care has to be taken when sourcing a head to use on your Mini.  
         
Different versions of 12G940 heads used either 1 5/16" (33mm) or 1 13/32" (35.6mm) inlet valves; 1 5/16" is the correct diameter for an inlet valve in an original 
non-Cooper S Mini engine (exhaust valves are always 1 5/32" (29.4mm) diameter, whatever the application).  Cooper S, high performance Austin/Morris 1300 and 
MG Metro models somehow squeezed in the larger 1 13/32" diameter inlet valves.  Confusingly, the last Cooper S cylinder heads plus the aforementioned high 
performance 1300 heads are still 12G940 castings, even though they have 'eleven stud' fixings to the cylinder block (standard 12G940s are nine stud); they do 
however have an extra 12G1805 part number stamped by the thermostat housing for additional identification.  As mentioned at the beginning, these later Cooper 
S heads are dealt with in the next section.    
         
Late model 12G940 castings, used on 1990s Minis, can be distinguished by separate sculpted and machined areas around the thermostat housing and heater
take off, whereas the earlier castings are machined straight across from these areas to the rocker cover.  Once again, care needs to be taken here: do not 
assume that if you have identified a late casting it must be Mini specification.  Metros also used this casting with the heater take-off blanked off (as was the 
take-off on fuel injection and 1992-94 carburetter Mini heads), and the MGs had the larger 1 13/32" inlet valves.  Metro Turbos and ERA Mini Turbos similarly used 
late type 12G940 heads, this time with Mini sized inlet valves - the valves are however sodium filled and the deck of the cylinder head is thinner.
         
Lastly, mention should be made of the air injection cylinder head used on North American specification (NAS) Austin Healey Sprite Mk IVs, MG Midget Mk IIIs 
and Austin Americas between 1968 and 1974.  This head casting, displaying part number 12G939, is a strengthened version of the 12G940 including air injection 
ports for the NAS emission control systems.  While on the face of it not strictly relevant to a Mini parts catalogue, it is in all other respects a 12G940 head
and because of its increased strength it makes an ideal and reliable candidate for tuning treatment.  Plenty of new 12G939 heads were still around in the   
classic car parts marketplace at the beginning of the 1990s and while it will not be easy, you can find one even now if you want one.
         
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 included valve guides 
and studs or valve guides 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 1275cc 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 1275 GT 1969-80; please contact us for details.
    (early 12G940 casting)    
       - CYLINDER HEAD ASS'Y, with valves 1 Cooper carburetter 1990-91; please contact us for details.
    (late 12G940 casting)    
       - CYLINDER HEAD ASS'Y, with valves 1 Single point injection 1991-96; please contact us for details.
    (late 12G940 casting)    
       - CYLINDER HEAD ASS'Y, with valves 1 1275cc carburetter 1992-94; please contact us for details.
    (late 12G940 casting)    
       - CYLINDER HEAD ASS'Y, with valves 1 Multi and single point injection 1997 on; please contact us for details.
    (late 12G940 casting)    
2      - CYLINDER HEAD, bare, with guides and studs only  1 1275 GT 1969-80; please contact us for details.
    (early 12G940 casting)    
       - CYLINDER HEAD, bare, with guides only  1 Cooper carburetter 1990-91; please contact us for details.
    (late 12G940 casting)    
       - CYLINDER HEAD, bare, with guides only  1 Single point injection 1991-96; please contact us for details.
    (late 12G940 casting)    
       - CYLINDER HEAD, bare, with guides only  1 1275cc carburetter 1992-94; please contact us for details.
    (late 12G940 casting)    
       - CYLINDER HEAD, bare, with guides only  1 Multi and single point injection 1997 on; please contact us for details.
    (late 12G940 casting)    
         
Gasket Set      
Ill. No. Part No. Description Qty. Rqd. Remarks
3 GEG103SMC GASKET SET, cylinder head 1 Carburetter models 1969-94; see note below.
  GEG103SMI GASKET SET, cylinder head 1 Single and multi point injection 1991 on; see note below.
The cylinder head gasket set, also known as a 'decoke' or 'decarbonising' set, includes the cylinder head gasket, manifold gasket (standard in the carburetter type 
gasket set, reinforced in the injection type set), two thermostat housing gaskets (one extra to cater for engines with sandwich plates), HS2, HS4 and HIF carburetter 
gaskets (carburetter type gasket set only), rocker cover gasket, plus heater take-off gasket (carburetter type gasket set only).  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 GEG300 GASKET, cylinder head, copper 1  
5 CAM150 STUD, cylinder head, long 4  
6 CAM151 STUD, cylinder head, short 5/4 Qty. reduced 1990-96.
  TAM1617 STUD, cylinder head and coil bracket 1 1990-96.
7 51K1193 NUT, cylinder head to block 9 1969-78 standard fitment.
8 PWZ106 WASHER, plain 9 1969-78 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. 1969-78 heavy duty alternative.
  CAM4545 NUT, flanged, coil bracket to cylinder head stud 1 1990-96.
         
Plugs and Adaptors      
Ill. No. Part No. Description Qty. Rqd. Remarks
10 2K1345 PLUG, oil hole, cylinder head 1 1969-80, alternative.
  6K808 PLUG, oil hole, cylinder head 1 1969-80, alternative.
11 CDU2601 RIVET, oil hole, cylinder head 1 1990-96.
  LYQ100050 RIVET, oil hole, cylinder head 1 1997 on.
12 12G2092 PLUG, water hole 3 1969-96.
  154545A PLUG, water hole 3 1997 on.
13 AEA771 PLUG, water and dowel hole 2  
14 12G3503 PLUG, cleaning hole 2 1969-96.
15A 12A2075 ADAPTOR, by-pass hose, long 1 1969-80 and 1275cc carburetter models 1992-94.
15B CAM4126 PLUG, bypass adaptor blanking A/R 1990-91, Cooper Rover Special Products and Cooper Carburetter (if fitted). Also use if thermostat blanking sleeve is fitted.
15C 3H2963 CLIP, bypass blanking plug A/R  
         
Thermostat Housing and Fixings    
Ill. No. Part No. Description Qty. Rqd. Remarks
16      - 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
17 GTG101 GASKET, thermostat housing, cork 1/2 Qty. 2 required 1990 on.
  GUG705558 GASKET, thermostat housing, paper 1/2 Qty. 2 required 1990 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 1990 on).  
         
Ill. No. Part No. Description Qty. Rqd. Remarks
18 CHS2515 STUD, thermostat housing 3 1969-80 (carburetter models).
  CHS2524 STUD, thermostat housing and sandwich plate 3 1990-91 (carburetter models).
19 FNZ105 NUT 3 1969-91 (carburetter models).
20 PWZ105 WASHER, plain 3 1969-91 (carburetter models).
21 DAM7760 BOLT, thermostat housing and sandwich plate 3 1991 on (injection and 1992-94 carburetter models).
         
Heater Valve and Fixings       
1275 GT 1969-80      
Ill. No. Part No. Description Qty. Rqd. Remarks
22      - VALVE, heater 1 See note below.
For details of the heater valves, 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
23 88G221B GASKET, heater valve 1  
24 53K402 STUD, heater valve 2  
25 FNZ104 NUT 2  
26 LWZ304 WASHER, locking 2  
         
Heated Manifold Adaptor and Fixings     
Cooper Carburetter 1990-91    
Ill. No. Part No. Description Qty. Rqd. Remarks
27 12G2534 ADAPTOR, heated manifold take-off 1  
28 88G221B GASKET, adaptor to cylinder head 1  
29 TAM1368 SCREW, adaptor to cylinder head 2  
         
Combined Inlet and Exhaust Manifold Fixings    
1275 GT 1969-80 and 1275cc Carburetter Models 1992-94    
Ill. No. Part No. Description Qty. Rqd. Remarks
30 GUG704053MG GASKET, manifold, standard 1  
31 53K487 STUD, manifold 6 1969-80.
  LYR10028 STUD, manifold 6 1992-94.
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. 
         
Separate Inlet and Exhaust Manifold Fixings    
Cooper Carburetter 1990-91     
Ill. No. Part No. Description Qty. Rqd. Remarks
35 GUG704053MG GASKET, manifold, standard 1  
36 53K487 STUD, manifold 6  
37 PWZ105 WASHER, plain   6  
38 GHF261 NUT, brass, manifolds to cylinder head 6  
         
Separate Inlet and Exhaust Manifold Fixings    
Injection Models 1991 On      
Ill. No. Part No. Description Qty. Rqd. Remarks
39 GUG704063MG GASKET, manifold, reinforced 1  
40 LYR10028 STUD, manifold 6 1991-96 single point injection.
  53K487 STUD, manifold, outer 2 1997 on multi and single point injection.
  LYR10028 STUD, manifold, inner 4 1997 on multi and single point injection.
41 PWZ105 WASHER, plain   2  
42 GHF261 NUT, brass, manifolds to cylinder head 2  
43 LYH10008 NUT AND WASHER, manifolds to cylinder head 4  
         
Rocker Cover and Fixings      
Ill. No. Part No. Description Qty. Rqd. Remarks
44 12A1530 ROCKER COVER, steel, black 1 1969-80.
  LDR10074 ROCKER COVER, steel, black 1 1990 on.
  LDR103490 ROCKER COVER, steel, citrus green 1 1998, Paul Smith limited edition.
45 CAM6822 ROCKER COVER, alloy 1 Accessory (also MG Metro) item.
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
46      - DECAL, rocker cover 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
47 13H2296 CAP, oil filler, black plastic, with breather 1  
48 GFE6007 CAP, oil filler, red plastic, with breather  1 For CAM6822 alloy rocker cover.
49 12A403 SEAL, plastic oil filler cap 1 For 13H2296 cap.
50 GEG401 GASKET, rocker cover 1  
51 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
52 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.
53 1B2925 DISTANCE PIECE 2 Original zinc finish.
  12G687 DISTANCE PIECE 2 Alternative chrome finish.
54 1A2156 WASHER, cup 2 Original zinc finish.
  12G679 WASHER, cup 2 Alternative chrome finish.
55 12A1358 BUSH, rubber 2  
56 12H2557 NUT, extension, air intake to rocker cover 2 1990-91 carburetter models.
57 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
58 12G1926 PEDESTAL, rocker shaft, with oil hole 3  
59 12G1927 PEDESTAL, rocker shaft, with tapped hole 1  
60 2A258 SCREW, locating rocker shaft 1  
61 2A515 PLATE, securing screw 1 1969-74.
62 2A259 PLATE, securing screw 1 1974 on; will fit 1969-74 models.
63 51K885 STUD, long, rocker cover and rocker pedestal 2 Outer pedestals.
64 CHS522 STUD, short, rocker pedestal 2 Inner pedestals.
65 LNZ205 NUT, nyloc, pedestal to cylinder head 4 1969-80.
66 PWZ105 WASHER, plain (not used on tapped pedestal) 3 1969-80.
67 PWZ106 WASHER, plain (not used on tapped pedestal) 3 1969-80.
68 NH605040 NUT, pedestal to cylinder head 4 1990 on.
69 PWZ105 WASHER, plain (not used on tapped pedestal) 3 1990 on.
70 AEG399 ROCKER SHAFT ASS'Y 1 1969-74.
71 12A1950 ROCKER SHAFT 1 1974 on; will fit 1969-74 models.
72 6K878 END PLUG, plain 1 Included in AEG399 rocker shaft ass'y.
73 2K4608 END PLUG, screwed 1 Included in AEG399 rocker shaft ass'y.
74 12G1313 ROCKER, pressed steel 8 First rocker type.
75 12G1221 ROCKER, forged 8 Second rocker type.
76 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, plus the rocker spacing washers, are correct for the type of rocker.  Note that the forged rockers have replaceable bushes, whereas 
the other two designs do not.      
         
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
77 2A21 BUSH, rocker 8 Included in forged rocker.
78 5C2436 RIVET, bush to rocker 8 Included in forged rocker.
79 12A1215 SCREW, tappet adjusting 8 Use with pressed steel rocker.
80 6K654 NUT, locking screw 8 Use with pressed steel rocker.
81 AEG167 SCREW, tappet adjusting 8 Use with forged rocker.
82 NT605061 NUT, locking screw 8 Use with forged rocker.
83 12H3376 SCREW, tappet adjusting 8 Use with scintered rocker.
84 51K1178 NUT, locking screw 8 Use with scintered rocker.
85 6K556 SPRING, rocker spacing 3  
86 AEG168 DISTANCE PIECE, exhaust rocker 6 For pressed steel and forged rockers.
87 2A18 WASHER, double coil, outer ends of shaft 2 For scintered rockers.
The distance piece AEG168 is used to shim forged rockers on their shaft correctly over the exhaust valves.  It is only required on big bore (970, 1071 and 1275cc) 
cylinder heads, where the valves are spaced further apart than is the case on other A Series engines.  The wider scintered rockers do not require these shims, so 
instead revert to the more usual A Series set up of using double coil (or 'Thackery') washers at either end of the rocker shaft.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
88 6K555 WASHER, plain, outer ends of shaft 2  
89 ZPS314 SPLIT PIN, outer ends of shaft 2  
         
Valve Guides and Valve Seat Inserts    
Ill. No. Part No. Description Qty. Rqd. Remarks
90 12G1111 GUIDE, inlet and exhaust valve 8 Standard size.
  12G1111010 GUIDE, inlet and exhaust valve 8 0.010" oversize.
91 12G1089 INSERT, inlet valve seat 4 1969-80, not lead free fuel compatible.
92 12G1090 INSERT, exhaust valve seat 4 1969-80, not lead free fuel compatible.
  TAM2069 INSERT, exhaust valve seat 4 1990 on, lead free fuel compatible. 
         
Valves and Valve Springs    
Valves are a lot more simple on the Mini 1275cc cylinder head than on other A Series heads.  There are only two types, identifiable by the grooves on the valve
stems into which the retaining collets locate.  The 1969-80 design of valve has a single collet groove 1/4" deep, whereas the later (lead free) valve design fitted in 
the 1990s has a very distinctive triple groove.  Care must be taken to ensure that valves, valve caps and collets are matched before attempting reassembly.
The later triple groove valves, caps and collets may be used as replacements on earlier cylinder heads along with TAM2069 exhaust valve seat inserts as a 
lead free conversion.        
         
Austin and MG Metro components are also detailed here for the benefit of the many, many Mini owners who have transplanted Metro power units into their cars.
         
A range of uprated valves, valve springs and caps to suit most uses are also available from Somerford Mini; please contact us for details.
         
1969-80 (original pre-A Plus Mini engines)    
1980-84 (early A Plus Austin and MG Metro engines)    
Valves With 1/4" Collet Groove    
Ill. No. Part No. Description Qty. Rqd. Remarks
93 12G941 VALVE, inlet, 1 5/16" (33mm) dia. 4 Mini and Austin Metro engines.
  AEG592 VALVE, inlet, 1 13/32" (35.6mm) dia. 4 MG Metro engines.
94 CAM4601 VALVE, exhaust, 1 5/32" (29.4mm) dia. 4  
95 12G1015 SPRING, valve 8  
96 88G459 SPLIT COLLET, pair, valve retaining 8  
97 88G617 CAP, upper, valve spring 8  
98 AEG327 OIL SEAL, valve stem 4/8  
Oil seals were usually fitted on the inlet valve stems only, but they can be fitted on exhaust valves too.  Opinions differ on which is better - the choice is yours. 
         
1990 On (original A Plus Mini engines)    
1984-90 (later A Plus Austin and MG Metro engines)    
Valves With Triple Collet Groove     
Ill. No. Part No. Description Qty. Rqd. Remarks
99 TAM1058 VALVE, inlet, 1 5/16" (33mm) dia. 4 Lead free fuel compatible; Mini and Austin Metro engines.
  TAM1059 VALVE, inlet, 1 13/32" (35.6mm) dia. 4 Lead free fuel compatible; MG Metro engines.
100 TAM1061 VALVE, exhaust, 1 5/32" (29.4mm) dia. 4 Lead free fuel compatible.
101 12G1015 SPRING, valve 8  
102 CAM6975 SPLIT COLLET, pair, valve retaining 8  
103 AHU1897 CAP, upper, valve spring 8  
104 ADU4905 OIL SEAL, valve stem 8  
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