PCV leak

@famous bob
My 360 used to leak at the rear mainseal, because of a botched line-hone.
I tried the pan E-vacs, but they worked too good, and filled my mufflers with oil.
I re-engineered the baffles in the valve covers, which helped, but never cured it.
On the next regularly scheduled tear-down, I pulled the 2-piece neoprene rear seal out, and replaced it with a rope-seal from a 383. That more or less cured that particular leak.......... lol. and the E-vacs never went back on.
Instead I installed some Plasma-Moly file-fit rings which read so low on the leakdown gauge that I almost doubted it was being truthful.
But the 93mph trap, in the 1/8th, sorta proved she had plenty of power. I love those rings.PITA to fit tho.