HOPE THIS HELPS http://wkjeeps.com/wk_engines.htm Intake - Opens (BTDC).....15.0° Intake - Closes (ATDC)...268.0° Intake - Duration...........283.0° Exhaust - Opens (BTDC)..251.0° Exhaust - Closes (ATDC)...35.0° Exhaust - Duration.........286.0° Valve Overlap.................50.0°