Why is ther no formula to figure out port volume?

BJR, Moper, Mac mentions Edelbrock heads for a 4.04 x 4 inch arm stroker. (410 cid.)
How well do the Edelbrock heads fit into this cid and how far can it feed the 410 engine. Granted, this is a wide open question.
Lets just start with a stock as cast head.

I figured this question would help solve a few questions for others thinking of doing a stroker engine and wondering about what head to put on top. Edelbrock's tech one day told me there designed for stock stroke engines and strokers were not really being done at the time of the heads development.

That being said, by Edelbrock, it kind of leads me to beileve, without looking at spec one about the head, that the heads abilty in normal engine hot rodding would limit the head to a CID of something like a .030/.040 over 360. On a as cast head and normal like camming of the engine. Street performance wise.

Granted the head can be used on a 400+ engine at a lower rpm and be ok and a smaller engine at a higher rpm and be ok. This I get and all things within reason.

The search of power and speed is alot like relgion, many's ways to worship in order to get into heaven.