CRXDrew

The thing is you don't want a Tee at all off the block. You want a fitting that goes to a line that goes to a tee on the firewall. McMaster Carr is ur friend. I put all my oil line stuff together for like 50 bucks... sorry stevemode. :P

hotrex

easy out kit bottom line, possibly try heating the block up too, since the aluminum should expand faster thn the brass.

necro

Listen to this guy he's right. Dont put a T on the block next time. Put a line to connect to the T, and mount the T on the firewall. It's safer that way.

LateApex

And if you insist on using an NPT fitting hanging on by 2 threads, at least run a 1/8 NPT tap through the hole so you can thread it in all the way.