OK on my 216, I have have extremely rough running and excessive blow by from the road tube and the valve cover. Since the engine has been sitting for a very long time with an occasional start. I had carb issues due to ethanol eating some rubber gas lines. I am using non ethanol gas now, rebuilt the Carter YF carb, and may still have issues there. I do not have much change with turning the idle mixture screw. I have sprayed starting fluid around the base of the carb, vacuum advance, and disconnected the wiper motor line and have not found a vacuum leak. I have a gasket on both top and bottom of the new plastic carb riser. I have rebuilt this engine, it has new rings, been honed, and has a valve job. Timing was set at 5 degrees before TDC, and the engine ran great before the ethanol adventure.
I have not done a compression check yet for this issue.
I suspect either sticking valves or rings.
What are the thoughts out there on why this thing won't run properly?
