oil blow out IO-360

Jim Burns wrote:
It seems like I'm agreeing with Jim these days, I'd also say that something
is creating excessive case pressure. Along those lines I just tore down a
horizontally opposed Kohler that was blowing oil from the breather faster
than I could dump it in. It had blown a cylinder barrel seal, not a gasket,
just an RTV seal. The key is that something caused the seal to blow. What
did I find? Cracked exhaust valve guide that allowed exhaust pressures into
the case.

Would that show up in a compression test though? I"m getting 79's all
around in the compression test. The IA seemed impressed with the
compression. Also, my EGTs seem to be running about the same.

-Robert