How leaky are new FE blocks?

[ERA Chas]

Originally Posted by Silversmith

I used tips from ERA Chas & Rick to reset my oil pan & valve covers. They no longer leak But I'm still gettin oil loss via oil breather's!

Yes Silver they make some crank case pressure. But since you're so kind in your praise here's the rest of the secret to eliminate the breather splash problem.
This was hashed-out between Elmariachi and me after me hounding Barry to death.
The components to buy are: Summit's billet PCV valve, Moroso's BAFFLED (a slot in the bottom) deep PCV grommet, some 3/8 ID fuel hose and a couple of clamps. How ever you accomplish it, you want only one open breather on the motor-in my case it's the oil fill tube on the intake.
Here are the back of my intake, the grommet and PCV valve. The hole in the intake is too small so I slowly enlarged it with a die grinder to just over-size the grommet. The breather cap's hole should be made a snug fit to the slot in the grommet side (where it would pop into a valve cover).

Looking at the bottom of the grommet, you can just see the slot in the grommet-that's all you need or you'll drown the PCV.

Use a little white grease or anti-seize and the PCV will work into the grommet snugly-you don't want it too loose.

Install the grommet into the cover plate with studs used in the intake. Make a paper gasket for the plate to intake join. You want it removable as an assembly.

Find the big EGR port on your throttle plate and connect the hose from PCV to EGR.

Leaks will subside to nothing.