flying bee

When we bought our 1957 Tri-pacer in 2010 the engine had just under 1700 hrs since OH on an O-320 150hp narrow deck. We knew an OH was eventually coming some day and started preparing ourselves. A couple weeks ago during our annual we found that "THE DAY" is here. While bore scoping the cylinders we found that #4 was cracked and needed to be replaced. After removing the cracked cylinder we were exploring inside and found a crack in the case that extended from an oil hole in the cam bore ...