When I got the car home I pulled the spark plugs. #5 was so gummed up it wouldn't fire.
When I pulled the heads this cyl had a puddle of oil sitting on the piston (cleaned up before pic).
Looking at the valve seals, all were up on the valve stems. Soft yet, but wrong kind ?
Getting the heads re-built. Stronger springs. New cam etc.....
#5 is the clean one on the left. Oil & not firing made it clean.

Right side. #1 on the right.
