318 Valve Seats

[MOPARJ]

I Have The 1973 Model Year 318. Im Am Not Sure If It Has Hardended Valve Seats. In What Year Would They Have Started To Come With The Hardened Seats? Mine Runs Fine And Has Great Compression Numbers Either Way, Plus Im Running 91 Octane Always,but Thats Irrelevent. Thanks For Replies.

 

[dodge freak]

Its ok, I think I seen after 1971