If a plug was installed to be flush with the inside surface would this not stop the whistling. That way the tube hole yet left inside the port would be filled. Just a thought here. Seeing i have a few of these heads myself.hope this helps & Thanks for the warning.
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NovaMan/Twisted6/Larry

Larry/Twisted6
[oooooo] smile
Adding CFM adds boost smile
shocked God doesn't like ugly.