Cant seem to find any pics of an A+ cylinder head so that I can educate myself as to how they look and the differences between heads.
Has anybody got some pics they can post.
Thanks

No pics handy, but:
Taken from Calver's Corner...

"A+ head castings - despite having the same 12G940 casting number - are considerably different in appearance, loosing the flat area behind the thermostat housing and around the rest of the rocker/head stud areas to a sculptured look - where these areas are replaced by a 'sunken' cast finish.
The A+ castings were introduced with the appearance of the Metro in 1980, although some late 1275GTs (1979-on) had them fitted. Generally they are easily recognised by their colour - a putrid yellow on the small-bore castings and bright red on the large-bore ones, a paint finish that is VERY difficult to remove, even in a chemical tank.


The MG Metro Turbo shares the same valve sizes with the other non-'big valve' 12G940 variants but has 8mm, sodium-filled exhaust valves.

A+ heads generally have three collet grooves in the valves, collets are 14-degree cone taper instead of the 10-degree on single groove collets (so parts are not interchangeable between single and triple groove types) and the top-caps have a raised ridge around the collet hole".

Keith Calver
Article Date: Oct 27, 2003

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Kev

I have one. Yes the quickest way to tell is 3 collet grooves and some have no radiator bypasses.

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Lillee - 1969 Morris Mini K

What about the water gallery plugs on the head face?

Mine has these, one is punctured.
It is covered by the head gasket anyway so this shouldn't be an issue.




You can see them here... the one on the left is the one with the puncture.


Graham Russell did the head modifications if you are wondering

The earlier 940 and 1316 heads had metal plugs in there, where yours has the welch plugs. Never gave any trouble.

The 2 drilled brass ones at bottom of your pic are normal to all 940 heads, but being only pressed in they do tend to move into head if the motor is overheated. If so I tap the head holes 3/8 BSP, screw 2 drilled brass plugs in with Loctite, then deck the plugs and the head.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.