stock bore on a b16a is 81mm....if i increase the bore to 81.5 all i have to change is the pistons to 81.5 right? and nothing else?

and also, am i right in thinkin...that PSI doesnt really matter, in terms of boost, i mean 7psi boost on a small turbo will be the same as a say (roughly) 4-5 psi on a bigger turbo?

so whos to say 7-8psi is reliable on a stock block when it matters on the turbo being used?

 

What turbo are you thinking about using?

 

garrett 57 trim...or the standard 1 that comes with an edelbrock performer x kit which is a gt28 i THINK..does an increase in psi mean there will be more lag?