My nephew Nick bought a Toyota pickup truck from a little old lady 'who only drove it on Sundays'. Turns out it has a blown head gasket, which got me to thinking about all the major engine repairs I have done.
Suzuki 250 twin two-stroke - complete rebuild - Ohio
Porsche 911 - complete rebuild - Austin
195x International Harvester pickup truck straight six. Replaced head gasket, rodded radiator - Austin
197x Ford Pinto - replaced head gasket - Austin
197x Toyota Corona - replaced cracked head - Austin
Replacing the head gasket usually meant taking the head to the machine shop and having the head surfaced and the valves ground. I think the Pinto needed a new cam as well. Overhead cam, you know.