<page_title> GM Family 1 engine </page_title> <section_title> Pre-Ecotec </section_title> <table> <cell> 79 mm (3.1 in) <col_header> Bore </col_header> </cell> <cell> 81.5 mm (3.21 in) <col_header> Stroke </col_header> </cell> </table>
The GM Family 1 engine has a 79.0 mm (3.11 in) bore and a 81.5 mm (3.21 in) stroke.