WARNING - AMD oil filler caps

Devil's advocate-

Have you considered that the aftermarket fill tube could be the cause rather than the cap?

Perhaps the "ears" that grab the tangs on the cap are shaped differently than the actual valve cover.

The extension is a Chrysler piece that has worked with a few stock caps over 50 years - try again

But then he couldn't get all the attention on an internet forum. Plus, his problem would be fixed.

Where did this **** come from? Just how would getting attention here do anything for me? I posted it here to help fellow FABO users from having an unnecessary failure. I thought better of you, Rusty...