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MG MGA - Engine marking

my 1500 engine is topless at the moment and I can see a "3" which has been stamped on the block within a diamond shaped frame. The bores are much too smooth for an un-bored 1957 engine - does the mark relate ?
Roger Walker

I do believe it is the inspectors stamp from the manufacture process. If the engine was bored oversize the oversize amount would be stamped at each cylinder. ie .010, etc.

... CR
C.R. Tyrell

After boring at the factory, the bores were checked for tolerance and stamped with a number. The asssembler would then select the correct grade piston to suit the bore.
Dave O'Neill 2

Interesting - thanks folks

Roger Walker

This thread was discussed on 02/09/2015

MG MGA index

This thread is from the archive. The Live MG MGA BBS is active now.