[jbsoukup]

My anti-siphon failed which resulted in water in the crankcase oil.
I have the bronze one identical to the one in Nduttons' photo.
Turns out there is (was) some kind of rubber one way valve in the brass nipple on the top, which allowed breaking of suction when the engine was turned off while not allowing water to squirt out the top when the engine was running.
I eliminated those guts in there, made sure it was all cleared out, and ran the small hose on top into the sink drain hose. This results in water spitting out constantly while the engine is running, into the sink drain, which naturally results in the sink through hull needing to be open.
It also results in a clearly heard sucking sound when the engine is shut down.
A very comforting sound to my ears.

I'm wondering if one could get water incursion, through the manifold due to siphon action, into the cylinders without it also showing up in the oil?

As a side note, some of the best advise I got from the C30 guys here was to replace the engine wiring. Not all that hard to do and totally resolved my intermittent hard starting, shutdown, and charging gremlins. I could go about that, on but seems a little off topic.