Morris Minor head differences?

[lewis s]

Does anybody know if a Morris Minor 948cc head is the same as the 1098 one?

Thanks

[SWH]

Fairly sure it isn't; the 1098 in my father's old clubman had a 12G202 from memory (hmm, is that good or bad?!)... played about with a 12G940 on top of that after a good read of the Vizard A Series book.... Anyway, that matches up with a random Google, finding this (which looks about right):

http://www.calverst.com/articles/ch-cylinder_head-...

[ARH]

There are basicly 2 types of a series engine, big and small. 1275's and copper s are big. the rest are small. any head from a small engine should fit a 1098, although the compression ratio will need sorting out. If i remember correctly the 1098 engine needs much bigger combustion chambers than a 998. not sure about the 948. an mg 1100 heaq is the one to use 12g295 if you can find one these days. if it hasn't been on a 998 engine it will fit straight on.

[bigblock]

The difference between a 2A629 948 cylinder head and a 12G202 1098 cylinder head is a larger combustion chamber and larger inlet valves. Otherwise the heads are inter-changeable, although fitting a 948 head to a 1098 engine would be a bit of a step backwards.

[Mr2Mike]

bigblock said:

The difference between a 2A629 948 cylinder head and a 12G202 1098 cylinder head is a larger combustion chamber and larger inlet valves.

The ports are different as well; the 12G202 has larger, square inlet ports with a locating ring for the manifold. The 202 is probably the best of the closed chamber heads (which isn't saying much, they all flow quite poorly ).

Edited by Mr2Mike on Monday 4th October 17:59