In 1966, the letter designation only dealt with displacement--not horsepower. For instance, the 383 cid had a letter designation of "G" even though it came in two horsepower ratings--270 & 325. The "D" designation was for the 273 cid even though it came in two horsepower ratings--170 & 235. It follows that the "J" was very likely for both ratings--350 & 365. In 1967 extra letters were added to differentiate the different horsepower ratings. For instance "K" was for the 350/440 and "L" was for the 375/440 (and "M" was for Special Order). I don't believe that "HP" was stamped on engine blocks until 1967 or later. Jack ------------------------------------------------------------------ On Jan 18, 2006, at 4:51 AM, xramkroozer@xxxxxx wrote: > HI DAN & GROUP, IT SOUNDS LIKE WISHFUL THINKING ON YOUR PART. > BOTTOM LINE, K > SIGNIFIES 365 HP, J SIGNIFIES 350 HP, AS IT LEFT THE FACTORY. >> It is my opinion, based on various inputs, that >> this car is indeed a 440 TNT, 365 hp. I have never seen a "K" in >> all the >> 440 >> TNT cars that I have competed against over the years. > > 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/