my 73 mach 1 has the same exact problem, ive been told its the header gaskets, one time my gaskets blew so it would make a backfiring sound, so i had to double gasket that side but they still click, louder at more rpms right?? i hate this problem and it has bothered me for 2 years, some one has to have idea, you my just need one new gasket
hope i help
vince
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