There has, and IMO opinion it has something to do with the crossdrilling of stock 5.7 cranks. The fellow that was having issues with a circle track engine put in an aftermarket crank and has been having success ever since IIRC. This issue has not reared its ugly head to my knowledge in the LX community with guys turning 7K with 6.1's or newer Eagle 5.7's. Also there is an emptying of the pan issue that happens at 7k + rpm that has been mentioned and the FS drag paks are all running 10qt pans because of this it seems.