Cyliner Head Specifications

Cylinder head specifications guide chart



Different heads for the A-series engine

Number  Inlet   Outlet  room    Normally fitted to      Fits also

2A628   1 1/16" 1"      24,6cc  850 Mini, A35,A40       998,1100 and Cooper
12A1456                         Minor, SpriteMkI        
2A629

NOTES:-   round port on intake.


12A1458 1 1/16" 1"      24,6cc  late 850 &998           as above but a hole
                                                        in the front for temp
                                                        gauge


12G185  1 1/16" 1"      24,6cc  997 Cooper              fits as big valve head
                                                        for 850 & 998 


12G202  1 5/32" 1"      26,1cc  Austin/Morris 1100      As above but square 
                                                        formed inlets
NOTES:-   square intake ports


12G206  1 7/32" 1"      28,3cc  Early MG 1100           upgraded 12G202   

NOTES:-	  large square intake ports with location rings


12G295  1 7/32" 1"      28,3cc  998 Cooper,MG 1100      Fits on 998 when bigger
                                Sprite MKIII            valves are needed


12G940  1 5/16" 1 5/32" 21,4cc  1275GT,A/M1300          Can be modified to the
9 Bolts 33,3mm  29,53mm         Sprite MK IV            specifications below
                                Marina 1,3             

NOTES:-   good ports in standard condition 


12G940  1 13/32"1 5/32" 21,4cc  Austin 1300 GT          Fits on 1275 Gt when 
11 Bolts 35,6mm                 MG 1300 MK II           bigger valves are needed
                                late Cooper S


AEG165  1 13/32" 1 7/32" 21,4cc Cooper S                Can be used instead of
12A185                                                  the 11 bolted 12G940
AFG163
NOTES:-   12a185 was early casting coded yellow afg163 is later colour coded 
	  brown or blue

12G940  1 5/16" 1 5/32" 21,4cc  Turbo MG
NOTES:-   sodium cooled exhaust valve and improved cooling but thinner deck.


CAM4180 1.0625" 1"	25.5cc	998 Mini A+ and lead free