A customer asked me what year did AMC start using bridged rockers. I could not give him a window. Always though 74 but know that these first appeared in 1973, just not sure how early. A 401V8 I have out of a 73 AMX has a valve cover tag of 612Z05 which is December 5th, 1973 401. The heads are casting 3220602 E and have bridged rockers, the flexplate is dated 7 73 (July 1973) and engine never been apart. Waterpump 3215719 1 never replaced so as I look at this, I am trying to establish a timeline, or window as to when AMC first started using bridged rockers on AMC heads. This is earlier than I thought. Ideas? Eddie Stakes Planet Houston AMX 713.464.8825 days eddiestakes@xxxxxxxxxxxxxxxxxxxx www.planethoustonamx.com ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/BaadAssGremlins/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/BaadAssGremlins/join (Yahoo! ID required) <*> To change settings via email: BaadAssGremlins-digest@xxxxxxxxxxxxxxx BaadAssGremlins-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: BaadAssGremlins-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/