Hello folks;

I have recently enhance my 1971 z; removed emissions system etc. mechanic installed K/N breather filter on valve cover. The problem is thja t it spews oil all over the ex manifold etc and doesn't make for pleasant driving in oil fumes. Any helpful suggestions.

Needs to be plumbed into an air filter, like the factory did. Also, check to make certain your PCV valve isn't clogged.

Thanks Arne;

Needless to say factory filter has been removed. using Ramflo air filters on SU's.

any suggestions

Moose70z

The '70-72 factory air box will perform better than Ramflo's unless you have air horns inside them. SUs need a smooth airflow for good metering performance. So if you don't have air horns in them, plan to get some or replace the original air box.

If you stay with the Ramflo's, drill a hole in the rear plate of one of them and plumb the breather to that. Get rid of the mini-filter entirely.

And again, make certain that the PCV valve is not clogged. If you are spewing that much out the breather you may have excessive crankcase pressure.

Thanks again Arne;

I'll port the Ramflos for now and see how that works. I have not had any issues to date with carb function since emission sys. and factory airbox have been removed; aside from the oil fumes. Good idea to check PVC and crankcase pressure. Would the Cusco oil catch tank have any mitigating affect?

Moose70z

FWIW, I just changed from Longflo filters to the factory air cleaner, and couldn't be happier. The stock air box does perform a lot better, and the exhaust note is better also.