Broken valve spring retainer

[69 500]

I really don't what you think those marks are common sense says change ALL the retainers and recommend purchasing the correct valve springs for the cam you are changing TO. also the very best camshaft for Mopar is "Racer Brown" he knew cam science better than the Chrysler and proved time and time again ,he sold the bussiness to Jimmy Dowel of Baltimore Maryland and still operates under "Racer Brown",he has made several "cheater" cams for me over the years ,not bye cam lift but rather cam centerline lobe placement . 1 410 866 7660 

[Katfish]

I gotta disagree, never seen a machine mark that was crooked.
Maybe the other 2 lines, but calling that zig zag crack a machining mark is a stretch.