I currently own a 1990 90Q 20 Valve (Produced in March of 1990). I am a little curious. What are the differences between the pre and post March production models. Are the any preferences one way or the other. Sent by: Michael Benno Phone: (612) 591-0009 Fax: (612) 591-0029 E-mail: mbenno@.mr.net Date: 12/27/95 Time: 12:44:57