OK! That's clear! I think I remember now that un-engineered changes up to 15% over the max capacity normally fitted to that chassis (from the same manufacturer) don't need engineering.

I just wondered, since the EG and DC2 chassis are meant to be the same (???) whether the 15% would reach to 1.15 times 1834cc (or whatever the capacity of DC2 and DC2R's are) which is just over 2.1L, therefore - technically - allowing the use of a K20 in an EG.