Hi group. I just acquired a pair of what I thought were 440 heads. The PN is 4006452 but they don't have hardened seats and they have full combustion chambers unlike the 413 heads from my engine that are flat beyond valve area. The valves are 2.08 int. and 1.743 exh. The also have smaller springs and no dampers. What are they? My original heads are PN 2206324 with 2.08 int. and 1.610 exh. Minnesota Marshall Red G, 27 & 28 Dodge Brothers. 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/