Different heads for the A-series engine
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Number. Inlet .Exhaust. CCs. Normally fitted to. Fits also
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2A628 1 1/16" 1" 24,6cc 850 Mini, A35,A40 998,1100 and Cooper
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12A1456 Minor, SpriteMkI
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2A629
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NOTES:- round port on intake.
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12A1458 1 1/16" 1" 24,6cc late 850 &998 as above but a hole
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in the front for temp
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gauge
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12G185 1 1/16" 1" 24,6cc 997 Cooper fits as big valve head
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for 850 & 998
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12G202 1 5/32" 1" 26,1cc Austin/Morris 1100 As above but square
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formed inlets
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NOTES:- square intake ports
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12G206 1 7/32" 1" 28,3cc Early MG 1100 upgraded 12G202
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NOTES:-
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12G295 1 7/32" 1" 28,3cc 998 Cooper,MG 1100 Fits on 998 when bigger
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Sprite MKIII valves are needed
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Minisplus has special longer valves for this head
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12G940 1 5/16" 1 5/32" 21,4cc 1275GT,A/M1300 Can be modified to the
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9 Bolts 33,3mm 29,53mm Sprite MK IV specifications below
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Marina 1,3
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NOTES:- good ports in standard condition
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12G940 1 13/32"1 5/32" 21,4cc Austin 1300 GT Fits on 1275 Gt when
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11 Bolts 35,6mm MG 1300 MK II bigger valves are needed
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late Cooper S
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AEG165 1 13/32" 1 7/32" 21,4cc Cooper S Can be used instead of
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12A185 the 11 bolted 12G940
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AFG163
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NOTES:- 12a185 was early casting coded yellow afg163 is later colour coded
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brown or blue
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12G940 1 5/16" 1 5/32" 21,4cc Turbo MG
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NOTES:- sodium cooled exhaust valve and improved cooling but thinner deck.
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CAM4180 1.0625" 1" 25.5cc 998 A plus ULP
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