Port question

[Bobby32 0]

I have 5.38 cubes after displacements other than port. My tuning is 32hz. I have an 8'' port going 12.75'' in the box, 12.75'' is my limit because I want 8'' of clearance from the bottom of port to bottom of box. Anyways, I have 12.75'' in and I have 7.8'' out of the box for a total of about 20.6'' of port. The port inside the box takes up .38 cubes so that leaves me with 5^3 inside the box after displacements. I think I have too much port length on the outside of the box, but I can still cut the port down. Any idea on what it should be?

[Bobby32 0]

up

[bigrank916 72]

The math looks right to me.