worst motors of all time

I had a Fiat 850 spyder that was fun to drive if you could keep the motor running. Sloppy distributor, poor carburation and cooling problems due to the rear reverse draft radiator.
Sister had a $600 Fiat 850 spider, cute car, sucked! She bought new pistons and "Tony" never machined the raw cast tops to fit the head so it hit the valves. He replaced all of them under warranty and she sold it a month later. A week after she sold it she saw it burning on the side of the local freeway! They are about $12k now in decent condition. Ha! She also had Volvo P1800 which turned out to be a pretty good car but the seats were like lawn chairs, just a rubber woven sling type of seat on a frame...stock?