I have headers on my car but once burned a hole right through the pipe and made a whistling like a vw or something. Anyway I've always had problems getting the exhaust gasket seal on the bottom of the ports and am getting better at sealing them by first using a good copper gasket or at least the "Ultra Seal" and some really high temp silicone and don't fire it up before it cures. My port leaks usually sound like bad lifters and have replaced many good sets before wising up.
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65 Mustang fastback
347 DFI injected, TFS, too much to say
Just about everything custom
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