Mopar Performance Magnum valve covers on LA series heads?

RustyRatRod said

I've put LA valve covers on Magnum heads and they worked fine, but not the other way around.

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Thats it. Had it backwards.
Wtevr it was, its nothing id ever do.
I just remembered reading it from either mopar muscle around 99 or 2000, or that book "Chrysler performance upgrades".