Free Porting issue. *forehead slap*

[Agent Smith]

When I was building my echo 590 I made a mistake and ended up with some free porting. Didn't seem to affect anything and it turned out to be a decent runner

 

[Lightning Performance]

The absolute strongest running 660 I ever built was freeporting under the piston about .030".

Lowest exhaust?
And you had just enough room to drive the transfers back up or filled it with some goo?