I just changed my oil for the 2nd time today. When I started it up to circulate the oil, there was an awful "ratcheting" sound that came from the top end. It only lasted for a split second. I assume that this was caused by the oil being pumped to the hydraulic lifters, but it didn't happen the first time I changed the oil. Also, the engine typically revs to 2000 rpms when you first start it, and this time was no different.
Could this have caused any damage? Has anyone else had this happen?