I had some time to kill ,so I called 1/2 dozen Chevy dealers NY/NC--GM cam # 3904362 was a replacement forGM cam # 3863143 over 10 years ago--both numbers discontinued.------Crane started offering a blueprinted replacement for the discontinued 143/362-----This is what I've been told by several GM parts depts.???----Time to make the doughnuts
