Pulled valve cover and rockers on drivers side. Put my machinist level on the valve stems. There is about .010 rock on the stems. Hard to see who was the bad guy. Either #3 or #5 cylinder.
visual inspection shows #5 exhaust excessive tip wear with a sharp burr on the valve stem.
These are "906" heads. Leaded gasoline. I assumed they were updated to run on unleaded? Perhaps not.
Havent checked the other head yet. 20 degrees cold in garage!
1) Pulling #5 wire has no effect when engine is running.
2) #5 Exhaust valve stem tip is showing excessive wear. (Can be indicative of worn guide).
3) #3 or #5 valves appear to be sitting higher than the rest.
I think you can see where I'm going.... I wouldn't bother with checking the other side.
These pictures are from a set of 906 heads I had on a 440. Compression was good, except for 1 cyl was little low. Nothing crazy, but didn't run right.
This picture is with a ruler over the valve stems for 3 and 5. It sits level on them, but is showing air on the intake for 5 and 7.
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Here are the chambers.. you can clearly see the sunken exhaust valves.. I pulled the valves a few weeks ago, and they were all level when off the head and on the bench
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I love Mopars so much I'm date coding the skid marks in my underwear.
