46 replies to this topic

[minilee94]

Is it compatible with a 1275 engine (1380) fast road already has double valve springs and 11stud

Would be good to know ASAP as i need to say yay or nay to it

Edited by minilee94, 08 January 2013 - 09:46 PM.

[Noah]

Image.

12G940 is a 1275 big valve casting I think.

It should say 12G940 where the Rocker Assembly sits.

12G938 might be stamped else where similar to this head.

http://mk1-forum.net....php?f=5&t=5065

By the way, use google to your advantage. All I did was typed in 12G938.

[minilee94]

Yeah I tryed looking but just found Other cars than mini using it so wonded if it will work okay

[Noah]

I've never heard of that casting before, so your best bet is to ask one of the 'Mini Docs'.

I'd try Cooperman, he's a good source of information.

[MRA]

Its basically what most call a 12G940, 12G940 is the casting number. The finished machined casting would have another part number/s..... then the built up assembly would have other part numbers depending on the application differences, ie size of valve, qty of valve springs etc....

Edited by mra-minis.co.uk, 09 January 2013 - 12:35 AM.
after rereading for the third time I needed to clarify

[A-Cell]

From memory of the early 1970 tuning scene. The stamped number 12G293 is the assembly part no of the cylinder head (fitted with valves and springs) and was originally fitted to the 1275cc Sprite and Midget. The casting is 12G940. These were the preferred castings used for modification by engine tuners, they were drilled for the extra bolt, ports modified, bigger inlet valves, etc etc.
1300GT (ADO16) used the same casting and was machined to take the extra bolt, this application had a different part number. I believe all the early 12g940 castings had more metal, it was only some time later, possibly with the change to A+ that the casting had just enough metal. The myth that ST had the castings modified is just that, a myth.

[minilee94]

Il put a pic up i wernt guessing at all i was asking thats what the forum is here for

[minilee94]

Not very clear but may tell somink

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[minilee94]

Okay sorry mate i didn't see it was quoted

[minilee94]

So dilligaf will it work thanks

[minilee94]

Okay mate thanks i will buy now its only £109 is it worth it im building the engine atm i was going to get head rebuilt

[minilee94]

£100

[minilee94]

Nar im buying it not exchange

[minilee94]

Ohh yeah i see now nar i wont il make sure its the same head il get back

[minilee94]

Will this head be flowed out as standard to an extent and bigger valves like a cooper head or not