Somthing odd after the bore

After I had my head bored by ct racing....My quad seem to seep oil out of the head you know right were the two head pieces meet...But we tighted the head up and it stoped alot..but I see little bubbles like super small bubbles coming from the inner part of the head were the upper and lower head meet what could be wrong?

[EX 80]

I am pretty sure that you are not supposed to have any oil leaking. I built my motor myself and it never leaked a drop of oil

[Juggalo]

you should check the head gasket.