Hi Tim and All: The "T" in the engine stamping stands for "T-Series" or 1963. Of course the 41 is 413 as you note, built February 1st, 1963. I don't know about any specific truck designations, if there were any. (Even though I started at Chrysler in the Truck Experimental Dept. in 1963---had other more important things to think about I guess!!) Perhaps some other member can comment on truck specific designations, but this seems like a regular 1963 NYer/Imp block to me. 300ly, Gil Cunningham In a message dated 2/24/2006 12:51:13 AM Eastern Standard Time, tomlin@xxxxxxxxx writes: Group, 1. The machine shop I am using for rebuilding my 64 300-K 413 engine has another 413 on a stand. It is designated as T 41 and 2-1. I suspect the T means it is a truck 413, and the 2-1 is the build date. 2. Anyone know for sure based on the stamping? Thanks Tim Tomlinson PS The stamping is on the boss at the driver side front of the engine. [ [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/