Confusion reigns folks. Several opinions have been offered up re the HP stampings on 413 blocks. My 300F block is stamped P-41 and 3-2 on the boss. 2120529-3 R L 11-30-9 cast in the block one side, and 2120529-3 R L and a clock pointing to the 3 on the other side. There is no sign of any HP stamping. Does this mean that my block may NOT be the original block? The Torqueflite is correct numbers for a 300 box, and the engine had the original steel shim gaskets dated 1959. Can anyone shed some light? Do 300 blocks ALL have HP stamped on the boss......or not? One more thing. On about Page 5 of my 1960 Service Manual( not numbered) is a heading License Data. Lists starting vehicle numbers for Detroit and LA built cars,and starting engine numbers.Plus 2 pics of where to look. It says: Starting engine numbers will be as follows: Windsor PR-38 8-4 Saratoga PR-38 8-4 New Yorker P-41 8-4 Chrysler 300F P-41 8-4 Imperial P-41 8-4 Starting engine numbers?? What the heck can that mean? Mine is stamped 3-2 and I took that to mean Feb 3, as the build date of my car was Feb 10. Sometimes I find the Chrysler tech data somewhat confusing. Dave in New Zealand. Thanks, Dave in New Zealand. [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/