BMC A-series engine curiosity

I have a 948 engine which came out of my first Frogeye, back in 1971. It was painted gold so I assumed it was a factory Gold Seal unit. It has 950 cast into the block, but the engine number prefix is 8G. Over 33 years I have never been able to find out why this prefix violates the BMC convention. Any ideas?

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Les Rose
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