1 5/8 headers

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


The intake port short side on the Bloomer heads looks very impressive to me but I'm not even close to knowing what I'm looking at .