my guy does a precision finish hone,hes fussy and takes time to make each bore correct for a piston no matter how slight the difference,its his pet thing,he races old six cylinder holden cars in a class where mininmal modifications are allowed to the engine,the better you can get the piston and ring to seal the slightest edge you have.
you need all the edge you can muster chasing v rods uphill!we didnt know this guy,he bull dozed through frostyboys cb750 ride we went on a little while ago,i have tim(kghost) on his kr250 right on my rear wheel all the way here and blocking his way,as barry sheene says an ounce of handling is worth a pound of horsepower,just go with the .5 rebore!excuse my missed shift at 2:44,look how much ground i lost!
v rodas you have it all apart look in the intake runners/manifolds for this sort of production error and fix it,dont try and port larger just match up the connection and knock of any obvious lumps and casting flash flaws,if you run points dont pay too much attention to having both point gaps or dwell exactly the same,just be sure both pairs 1/4 and 2/3 end up firing exactly the same at full advance with a strobe(i use two stobes for this),forget about the "F"mark,where it idles so be it,just get them both firing the same at full advance,this is where these engines live anyway.
youll end up with an engine that runs a little sweeter than the others.