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Posted by Kaegi [24.113.81.122] on Monday, November 23, 2009 at 18:33:19 :
In Reply to: Truck engine difference posted by Don in Portland [24.22.121.187] on Monday, November 23, 2009 at 12:48:03 :
All Mopar flat heads from about 1932 or so on have hardened valve seats until the end of production whether car or truck or industrial. Ford followed suit in 34 or 35 and not sure if GM ever did go that way. by the late fifties gas had so much lead they were not needed.