So I brought a worked A15 a few months ago,
Its had a few mods, blue printed,balanced,skimmed,mild cam etc. Its running a single down draught A12 carb thats been been bored out and heavily modified by an oldschool datsun guru engine builder.
When I first looked inside the rocker cover it had alot of white'ish whipped cream looking oil through it.
At that stage it was just thought to be condensation (hopefully) so it was cleaned out and had an oil flush treatment and oil and filter change.
The build up of gunk was back in no time at all.
I then found about 5-10ml of water in the breather hose when i pulled it off the bottom of the air cleaner breather port. I got rid of that water and gave it another oil change but after about three hours driving when I checked the breather hose again the water was back and so was the gunk in the rocker cover.
I will try and explain the breather setup on it as its a little different than standard:
Ok so picture the breather hose coming up from back of block (off the metal pipe fitting that comes off the side of the block) and up to jst above height of rocker cover then arching down onto the rocker cover breather port.
Roughly at half way up that hose, as you view it in the eng bay, there is a "T" joiner.
Then hose comes off the "T" slightly curves down and then back up to the air cleaner hsg breather port (its a standard air cleaner hsg), - in the low point of that curve between the "T" and the air cleaner is where the water has been building.

There is no sign of the thick white oil on the dip stick min-max area, but there is a tiny amount around the top of the dip stick seal near the handle.

The radiator seems to keep an even level, Ive only topped it up a small amount (3/4 cup) maybe 2 times in as many months.

So, ahhh.., yea.. any thoughts as to the why and how would be greatly appreciated.
Is it just a symptom of having a modified carb?

Cheers