Cylinder head - 848 and 997cc

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848 and 997cc Cylinder Head Identification
Cylinder head details in this section are appropriate for the 848cc engine used in Minis between 1959 and 1984 and the 997cc engine used in the earliest Mini Coopers built between 1961 and 1963. The 848cc transverse engine was also to be seen in earlier Mokes and a small number of Austin Metro vans, plus in in-line' form, in an even smaller number of Austin A35 vans. The earliest variant of the Mini Cooper was the only BMC/Leyland product ever to receive the 997cc engine.
         
The cylinder head design for the 848cc Mini engine is shared with the standard tune Mini 998cc 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 models) or 12A1456 (later models) are appropriate for 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 997cc Cooper cylinder head was also fitted to various standard tune 1098cc engines, including the single carburetter Austin/Morris 1100 and the 1098cc Minis, plus the high performance 948cc Austin Healey Sprite Mk II and MG Midget Mk I. For identification purposes the casting number is 12G202 and the 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 848 and 997cc 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 848cc; please contact us for details.
    (2A628 or 12A1456 casting number)    
  - CYLINDER HEAD ASS'Y, with valves 1 997cc; please contact us for details.
    (12G202 casting number)    
2 - CYLINDER HEAD, bare, with guides and studs only 1 848cc; please contact us for details.
    (2A628 or 12A1456 casting number)    
  - CYLINDER HEAD, bare, with guides and studs only 1 997cc; 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 GUG
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