yeah and if you park outside you also get some condensation in cool weatehr that scares you evenmore.

i say vent it... thats what they originally did pre 1972 here in aus anyway....

You're better off plumbing it into the manifold, rather than into the air cleaner if you can. I'd rather coat the inside of my manifold, rather than my carbie.

going a bit off topic,
It's absolutley amazing how much water can collect in a catch can. I was certain I had a blown gasket, or a cracked head. But after doing a leakdown test of the cooling system, and putting a sniffer in the radiator, It's been given a clean bill of health.
I might need a bigger catch can though.

if the smell gets to you, then vent it into your aircleaner, the engine consumes so much air that the "smog" from the rocker cover is negledgable. if you don't mind the smell, then just let it vent.

I for one didn't like the smell so I made a pcv system to "flush" the crankcase of fumes. It seems to work well.

Anyone?

I just saw that this was a old post.

But , I am planning on putting in a catch can for my engine's tappet cover breather and also for the engine block's breather pipes. I will then put a small filter on top of this catch can so that it can still breath instead of breathing into my intake manifold(the tappet cover breather pipe) and breathing into the aircleaner box (the engine block's breather pipe).

Now my question, Is there any benefits of doing this?
Basically I noticed once how much smog and oily fumes comes out of the tappet cover breather pipe when disconnected and thought that this stuff will make my intake ports dirty and sticky. Will it not be better not to let this stuff get into the intake system?
I presume eventually because my car's carbs mix fuel and air it will "flush" away all the stickyness inside the intake manifold and make a little more power and breath nice clean air.

I am just too positive? Must I leave everything as it currently is?
Thanks

yeah, I got off my arse and plumbed up my catch can today.
I took some friends out for a squirt round the block to substantiate my claims about how fast it is, and no oil got sprayed around. I didn't hook up the out tube of the catchcan to the intake. I'm changing the air cleaner soon when I do my carb swap. and my catch can is baffled.

just get a oil breather/catch can... that will catch it all, you can route the pipe to return to the intake without the oil mist or just vent it if you love the smell of oil and petrol fumes

Does anyone know it nissan used any kind steel wool or similar, in the breather out the side of the block? I know there's a baffle plate. My motor is a bit puffy at Idle, and when I really let it have it, it blows oil out this port. I've thought of blocking it alltogether, and just using the breather port in the rocker cover. But I've heard of an A15 that kept blowing out the rear main seal.
Could my high volume oil pump be creating more "fog" to get sucked out the blowby?

I see Fat120Y's turbo engine has steel wool filled type breather caps.
What are your thoughts?