I wouldnt do it...
The stock one is 60mm and if you want to bore it to 70mm, that is 1 cm difference. You might bore into the cooling "tubes" that are in on the sides. If they are too thin, they might break from the heat then you'll get coolant into your engine.... (that would suck)
Also, what about gaskets? you won't be able to use the stock ones anymore...
I would just get a new/used one....
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