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The S engines would reliably run higher revs than the 1275GT engines.
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Fun cars back in the day.
I owned quite a few back then, the Cooper S, the 850cc, the 1000cc Clubman Traveller, the 1275GT with the 11 stud cylinder head engine swap and an old mini van that smoked like a bastard when you lifted off due to the valve stem rubbers riding up and down on the stems. 
The 850cc used to raise a smile. It had extended wheel arches with Wolfrace alloys, 4 Cibie Super Oscars (2 up/2 down) and dark tinted windows. It looked the business and lads wanted to race it, not realising that it did 75mph flat out down hill.
I always thought the 1275GT was simply an emasculated detuned version of the old 1275 Mini Cooper S.
But not so, apparently. 
My mini Cooper S had an 11 stud dual valve spring cylinder head, whereas my 1275GT had a 9 stud single valve spring cylinder head, and around 17hp less than the S. The Austin 1300GT, which also fitted in a mini, had the 11 stud dual valve spring cylinder head, so had similar output to a Cooper S.
Both the S and 1300GT ran twin SU’s, whereas the 1275GT ran a single SU.
However, this has nothing to do with the weather. It’s Varch’s fault for mentioning mini’s and setting me off waffling on down memory lane.

Apologies for going off subject.
