1 5/8 headers

Curious, are those the flange port openings you get for LA heads period? I’m wondering if they offer openings sized for a head like Trick Flow port, if there would be any benefit?

yes, they only make them this way. Looking at them, they appear generous, size wise.
my Bloomer heads were fine even with the smaller ( it would appear to me) Doug’s headers openings
I can’t imagine these wouldn’t work.
I know the Bloomers have a bigger intake port than Trickflows, but I didn’t/ haven’t measured my exhaust ports