If I remember correctly.? The timing belt on the 1990 & 1991?are suppose to be done every 60,000 miles and no longer than 5 years and the 1992 - 1994 are suppose to be done every 90,000 miles.? What changed to increase the duration of the service or have I got wrong information. Bob Blake 90 V8 91 V8 92 V8 93 V8 93 V8 5-spd