hello i have a set of je pistons stock 81.0mm bore came outa my 97 gsr was wonderin if they would fit the b1 or a1 blocks without to much hassle

 

They'll fit.

 

you may be using the shop to rehone and remove a little metal though. the piston to wall clearance is going to be on the tight side if you try and run them in a stock bore. stock is somewhere around .001 to .0015 and the JE stuff is probably .0025-.003 if it's 4032 and slightly higher if it's 2618