buy a bore gauge ,and measure them
i think they wanted you to buy stuff all the time , or not get sued for telling you something wrong??
rod / rod bolt stretch is one thing , but to resize every time you change a bolt is- ridiculous
spend the money on a good bore gauge ,and you can use it to check a lot of stuff you will get your money out of it, AND ITS ALWAYS GOOD TO DOUBLE CHECK A SHOPS WORK!!! 8)