Any fabo members up in Seattle or near by ?

So at what point does cubic inches start negating duration. I know there's different power ranges, so for a 440 my cam was 3300-7200, what is 30 cubes worth for adjusting the power range. I've been trying to figure this one out for a year or so.
it was my understanding that the length of the stroke starts heating up duration as opposed to cubic inches. But it's an inheritance that the bigger the stroke the bigger the cubic inches...