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well, if i recall, a 7m bored 2mm over make ~3.2L 91mm stroke x85mm bore. anyway, its been done, but i wouldnt do it unless the car is gonna be used for racing only as you may crack a few blocks if running high boost.
 

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never mind, i found an online displacement calculator and 85mm bore and 91mm stroke is 3098c. however, the 85mm bore and 86mm(5m) stroke is 2928cc .

heres the link to the displacement calculator. has a setting for metric and sae. pretty nice tool.

http://www.web-cars.com/math/displacement.html
 

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well, thats what i said, i wouldnt do it unless it was race only, and id be worried about blowing more then a hg. anyway, there was a guy that bored his 5m 2mm over and only problem he had was it went lean on the dyno and took out 4 forged pistons. and with 4 melted pistons made ~300rwhp. ill try to find the link to his site. it can be done but i wouldnt recomend it.
 
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