Truck: 1988 F350, Crew Cab, 4x4, 5 Speed ZF5, 7.3l IDI 213,000 miles.
Situation: Over pressurization in coolant system. Performed leak down test and air was escaping from at least cylinder 1 and pulled heads. After removing heads found coolant in cylinders 1 and a little bit in 5
I did...