ponycar5

I just recently got the motor for my 2003 G35 back from the machine shop after having the short block rebuilt and noticed that it now has flat top pistons. The original pistons seem to be slightly domed and have valve reliefs were as the new ones are just completely flat. Does anybody know if this is going to present a problems or will i lose some HP. Any help would be great, i searched the internet but found nothing.
thanks