TTI coated headers for a small block

crackedback said

I could have told you that and saved you a phone call. Std answer for them! Just like the SB A body z bar issue, never heard of it last year even though I spoke with them 5+ years ago about it.

I use a rubber mallet on the bottom side of the tube and pound the crap out of it. Helps if you can get it to rotate slightly first. Easier to do if the remaining flange is still attached to the head. Release the rear and twist it away from the head.

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Thanks for your input here crackedback, truly appreciated.

I tried rotating slightly, as much as I dared, with a closed crescent on the #7 flange, but no slop at all, but of course the remaining flange was not still attached.
I honestly thought I had pushed each effort, to the brink of damaging them. So next time I will pursue it further, since I am not the first to have this issue.

I suspected this might be a problem when I un-boxed them and saw the "slip tube" arrangement. It was only the second set of "new" headers I had ever purchased, the first coated ones, and the excitement was hard to contain, but the slip tube bothered me.