Are the 1991 US M5 and the 3.8 liter 1993-95 cranks the same? I am looking to build a stroker motor for my Euro M6, and the 90's M5 crank has been mentioned as an option to the custom manufactured Dinan stroker crank. Fahey's shop has mentioned that the M5 crank will not give as good a result as the M5 crank. Any ideas?