455 Olds 442

Hi again,

I am getting smoke out of one side of breather from the passenger side rocker cover vent when I turn off the engine. I have never seen this in another car before and being new to a 455 I am suspicious, it is leaving a small amount of oil in the breather.

Why would this be happening? I have had a mechanic tell me it is normal. It'll stuff up the air filter quickly I would imagine.

It even wisps out of the passenger side ram air vent on the hood.

Thanks,

Richard

oldcutlass

Check your PCV system. Your engine probably has some blowby as with all older engines, Rings and valve guide seal wear over time leading to the smoke.

455 Olds 442

You're probably right as the PCV elbow pipe is leaking oil at the base/top of manifold. Kinda fits your diagnosis doesn't it?

Rich

oldcutlass

I'd start there. Is the engine relatively fresh?

455 Olds 442

It is blow-by. Now that I have sorted out the vacuum hoses the smoke is not coming out the hood vents, was kinda cool having a smokin' gun! but not really a good look. We get a bit of smoke on accelerating after idling for a while. Time to do a rebuild. Just have to start saving ;-)

oldcutlass

I would also pull the valve covers and ensure the oil returns are not blocked. It may be as simple as bad valve guide seals.