I just bought an 87 hatchback for $200. The friend I bought it from said the electric fan went out and the temperature gauge went sky high. At the time he was sitting in traffic on a bridge on a hot day and didn't stop. the hotter it got the rougher it ran. as he made through traffic and back up to speed he drove a few more miles to home. It ran real rough. After I took the head off the gasket showed no signs of distress or leaking between cylinders. however there were some plugged water jackets in the head. If the gasket wasn't blown, what else could it be? the head is a cast head.