62mm GY6 Big Bore Installation Boring Size
 

I am putting in 62mm NCY big bore kit and getting ready to bore for it. I noticed that the stock set up has some skirt clearance of like atleast 1/16" and it appears that ********** recommends : "62mm Kit (175cc) – Machine cases to 65.15mm ± 0.075" which also leaves a similar gap.

Is buggy depot correct? Any advice is appreciated.
Charles