[crainholio]

Hold up...I had it in my head you were running an LS1. Disregard my previous post.

Next step I'd recommend is pulling the intake. Save the compression and blowdown tests for later if the intake diagnosis doesn't find anything.

You may find that the intake gasket on that bank is either damaged or wasn't being squeezed uniformly. You'll see a visible impression on the intake gaskets where the intake and head ports locate on the gaskets. Look for uniform depth on the impression outline...chances are you'll see that the bottoms weren't being squeezed. When this happens, the intake ports introduce vacuum into the lifter gallery and oil ingestion happens.

For example...a while back, Holley shipped Stealth Ram intakes that weren't properly machined and they wouldn't seal at the bottoms...causing the intake gaskets to fail and ingest oil down the intake ports on the heads. The intake surfaces were straight, but the angle was wrong.

Just an example of what you might be looking for, good luck and keep us posted.