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Honor to those who have gone before on this Memorial Day.

BT

I was replacing #1,2 exhaust headers for my Vans RV-12iS per Service Bulletin and observed this on Cyl #2 exhaust valve stem with just under 600 hrs on the motor, mostly Swift UL94 fueled with intermittent 100LL/Decalin and the most recent ~ 50-75 hrs Costco 93 UL/E10.

Is this normal? I was surprised at the amount of buildup. Any recommended actions to address / mitigate continued buildup?

Thanks,

Steve

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