80_cutlass

Did a search, but didn't come up with anything quite like this.

I have been tooling around in my 84 Cutlass that has a 350 Olds in it for about a week. Went out and did a country road top gear run out. The car ran fine, but blew a bunch of oil out of the breather....after less than a mile it was enough to make it look like spy hunter. I pulled over and it was even spitting some when I revved at a stand still. It has since stopped.

I am concerned that something is amiss.

I have stock valve covers with a breather not connected to an air cleaner and a regular PCV valve. PCV valve is new and connected at the botton of the carb. Engine has rock steady 18" of mercury vacuum at idle in gear.

I do not know if the oil pump I have is a high volume or not. This is the rescued motor.

Any thoughts?

sb

KRICHEN922

Gaskets? My breathers are leaking oil as well. If everything is connected right it probably is the gaskets. Then again you know more about cars than I do probably. I'm just a nub here.

dan2286

I am just taking a wild guess, but when you were flooring it, maybe to much oil made it up to the heads and is not draining fast enough. If that is happening, maybe the oil is getting forced out of the breather.

MN71W30

At wide open throttle the vacuume is gone and it makes the PCV valve useless. It sounds like you had it on the floor for a while. I've had cars that will leak out of the breather during hard driving caused from minimal blowby, I'm thinking most cars will do it, and that is the purpose of the breather. Our 496 BBC has 2 breathers with hoses that tap into the headers to draw out blowby at wide open throttle, they work good. No more oil smell and leaky breathers. JMHO

80_cutlass

Well, developments continue.

On the way to work today (normal highway driving) it started the same thing. I parked the car @ a local grocery store and caught a ride into work. I didn't want to kill the motor....so seems this a more significant problem than I originally believed. I've been driving the car for a few weeks and this is the first problem I have had like this.

sb

1969w3155

Oil passages in the heads? maybe somewhat clogged and not draining fast enough from the lifter area.

firefrost gold

check to see if the pvc hose is not collapsing I just ran into this.

scubastever

perform a leakdown and compression test.

you might have piston ring/oil ring damage.

this could cause excessive blowby, forcing the oil in the valve covers to get pushed up into the breather.

not good news, i know..

80_cutlass

Well, it ended up being multiple issues. First issue was an incorrect PCV and a collapsing hose. Second issue was/is poor quality valve covers and gaskets. I will check to see if something is clogging up the drainback passageways when I swap out the VCs this weekend.