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Old 06-13-2019, 05:04 AM
  #9  
Jesse Open
 
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Retarded timing increases cylinder temperatures.
I used to have a box of VW Bug pistons that had swallowed valve heads. All came from #3 cylinders with retarded individual timing on the #3 cylinder.

I will look at the aviation engine handbook later for their take. I personally would lean towards piston position.