Not sure why they replaced it. The PO's kid is who I ended up talking to (bought it from a dealer, got name off old title). He said that they did the timing belt and I told him it doesn't have one. He said it was running funny and they replaced the chain. It looks like they did something up front because the coolant bypass pipe had permtex on it (there should be an O ring, not permatex). Signs show that the timing cover was removed.......no seepage/crud where the head and block meet. I'm thinking of selling the '96 and keeping the '91 (I'll just have to leave 5 min. early wherever I'm going to compensate for the speed difference between the 2).