The number is a std part number.
There are of course different opinions on this subject, only you can decide what you are happy with.
They are made differently, if I could find the letter from V/R I would post it but can't, probably not got anymore.
Southampton UNI had perfect heads blocks etc all with NO MILEAGE, and only 10 minutes on them and they STILL failed.
I do appreciate what COSTINA says and to a large extent it is right, but certainly not all failures are due to this.
tabetha