Triumph Engine Number?

[Richard Smith <richard+1b5d11@mole.demon.co.uk>]

I've just bought a Triumph 2.5PI station wagon, with a very peculiar engine
number:
                X1242E

None of my regular contacts has heard of an X series of 2.5 engine numbers
- has anyone else?

The only other snippet of information I have is that the inlet ports appear
to be modified (enlarged and polished) in a similar way to another engine
I've seen which was reputed to be 'factory tuned'

Cheers,
Richard Smith
R.G. Smith Automobile Engineering - Triumph & Alvis Specialist