Talk about using the 'Way Back Machine'! Dredging this one up doing a search...
What Dennis said about "Make sure you have a baffle on the pcv side valve cover or you'll pull oil into the combustion chamber and think you have ring or valve problems. (don't ask how I know!) " strikes home as I'm trying to decide how to re-run all the vacuum lines on my 350 with Qjet.
I discovered what I think is a ring or valve guide issue, which prompted me to swap the heads. The old heads came off last year and after only 900 miles, the piston tops were covered in goo. The heads didn't have new valve guides, just new seals. The rings are supposed to be new(er) and it doesn't
burn oil or blow smoke out the back.
My PCV comes off the drivers side head and goes to the larger front port on the Qjet. Researching that, I come up with either T-ing the PCV hose with the brake booster line (it has the check valve already in-line), or putting the PCV hose on the large rear port that I now have the brake booster hose on, and moving the booster hose to the intake runner.
So, when I took the heads off AGAIN the other day to put the rebuild set on, the pistons are gooped up again after only a few miles since pulling the old set to troubleshoot last year... like 20 or less.
I've always suspected the PCV system as being the issue. The engine has regular factory valve covers with the baffles.. breather on one side. So how could that much oil be getting up the PCV valve and into the cylinders?
The only thing I haven't done is replace the PCV valve. I guess I'll re-route the PCV to the rear base of the carb and replace the valve.
Unfortunately the only way to see if I've fixed the issue is to pull a head... and that ain't happenin' again! I'll replace the engine before I go through that again.