By how much? You still haven’t answered that question.
Glad you find other peoples lack of knowledge comical.
Your starting to remind me of a certain 302 head lover
Ive already said it. NONE. Never make the port in the manifold smaller than the head. Ever. I realize you have to change your thinking to get it, but it’s still the fact. Watch the Morgan videos. The last thing you want in any system is corners. The next worse thing is changes in section. And then a mismatch going with the flow.