FIRST OF ALL, ITS NOT A METRO ITS A STORM, SO LEARN TO READ. sECOND I AGREE FELPRO IS THE BEST GASKET, HOWEVER MULTIPLE GASKETS WILL NOT CAUSE LEAKS, IT CREATES A GREATER PENETRATING SEAL TO PREVENT LEAKS, AND MINIMIZE FUTURE OCCURANCES OF LEAKS. THE EXTRA FEW MM'S A 2ND GASKET PROVIDEDS INSURES NO LEAKS AND WIL NOT SCREW UP TIMING, CAMPLAY, ETC. aND T OANWSER YOU QUESTION I HAVE CHANGED 40-50 HEAD GASKETS,MAYBE YOU SHOULD HAVE READ MY EARLIER POST WHICH WOULD TELL YOU I AM A PROFESSIONAL MECHANIC, AND I BET YOUR NOT.