MY LT1 will run circles around all but a few LS1 motors. for the people that do not know what they are doing or rely on others to do their work for them they might seem to be a pita but they are not. i know plenty of ls1 motors that have regular issues. as far as the 5.0s and the other windsor motors go '351's' they are damn hard to beat and don't forget the ls1 heads are actually a copy of sbf heads.