below is a picture of the last primary of my header (closest to the firewall) and to the right of it is a hole with a screw hole above it. could someone tell me what that is???

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1975 Dart Swinger 225 2bbl

You need to plug that up, it's the hole for the tube that goes from the AIR/"smog pump" in late heads (or in some late applications it just may have a charge tube hooked into the air cleaner). In this case, your exhaust is open to your firewall, plug with a cap, remnant of an old setup, thread and plug...

-D.idiot

and i guess that would be the source of that annoying tapping sound wow


p.s. thanx

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1975 Dart Swinger 225 2bbl