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I currently drive a 2006 nissan altima 2.5 and it has a QR25DE engine. I was curious that aside from changing my cam; would it be safe to have the bore increased to creat 3.0 displacement? Assuming that I have proper cooling in place to compensate of course. I know that warping and cracking etc could be risk factors. So I wanted to hear from you.
 

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Wouldn´t you be better off asking someone at an engine machine shop, than asking on this forum?
 

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They won't bore anywhere near that big. The cylinder liners are freestanding and much thinner where they join cylinder to cylinder, them being siamesed. You would be off into water jackets trying to go that big. The norm there is +.040" or 1 mm.
 
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