At a guess I'd say it;s the old 1.6 engine from the Mk3, couldnt tell you the code though...however, if you look at the block where the gearbox bell housing joins it will have the code stamped into the block.
looks like an X16XEL to me
as above, looking for the code is the only way to be 100% sure
Vauxhall history - 13S | 14NV | C16XE | X20XEV
i have an x16xel and it looks nothing like that
its the 1.6 block... my bro has it in his mk3
that is an X16XEL.
That is a X16XEL.......had one myself.....was nothing but problems!