How much power is lost through a 518

I have never ever been able to get a slanty up to the numbers of a hi-compression 360, even after I took it apart, and boosted the compression up to a true 9.5. And spent way too much time sorting the combo. Total waste of money and time....... compared to what I got out of my 367 .
Check out TBs post.

We've already figured out your 367 is at the top of the heap. Just ask you.