Why is this, seems like it plenty large enough to let the oil just flow through?

 

if no restrictions, it should be fine.

 

My head is going to blow up soon

There are too many different opinions on this forum!! Some say -8 is too small or pushing it, while others say -10 or bigger only. If it makes any differance, I am feeding my turbo with -4 line.

 

-8 will be fine. im using 5/8th return hose, which i think was close in size to -8

 

-8 is 1/2 inch

-10 is 5/8ths

I use a -3 feed and -10 return