I believe it's 504 in 88. I had an 88 for awhile, fun car, sold it to a friend. Just too hard to find stuff for, and it had some problems. We put a clutch in it a few weeks after I sold it to him, what a nightmare job that was, engine and all had to come out and was still a major pain to seperate the two after they were out,and even worse going back together. Fun to drive,not fun to work on.