I bought an 04 from a guy, who's a really good friend, who bought it from a guy that blew it up. The valves were shot and he replaced them, the cam chain, and put a hot cam in it. The piston was fine. Now when the motor blew the valve put a nick in the head next to the valve seat. The seat is fine but there is a nick next to it. Do you think this motor will blow again with this? I am already planning on getting a new head but I wanted to take it for a quick spin and break the cam in and I just want to make sure it's not a timebomb like this.