"Orval Fairbairn" wrote in message
news
The big problem on Lycomings is not fatigue, but corrosion of the #1 &
#2 cam lobes on engines infrequently flown. Moisture collects in the top
of the forward part of the crankcase, which is where the cam is located;
#1 & #2 cam lobes are right therre to get the moisture.

Prop acting as a heatsink? Cooler at the front due to airflow?

Paul