which engine have i bought?

yesterday, i bought a micra bottom half of engine. i've got block, sump internals etc but no head or manifolds. i bought it assuming its a 1L to put pistons into my 1.3 and make a high compression motor but ive got it home and had a better look and i'm worried its a 1.3. is there any way of telling ie. any markings on block/sump etc...
 
couldnt check as it was dark. measured the clutch though and its 180mm, so its a cg13. got an argument with a scrappy now as he promised it was a 1.0L :(
 
cheers frank. will have a look on the block for the code now its daylight! i came out with that previous one because Mr. Haynes told me so! 160mm for 1.0s and 180 for 1.3 and 1.4s
 
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