I just bought web cams 393 373, sprockets springs and retainers for my gen 1. I hear lots of bad stories with them not lasting and im hoping it is due to mainly installer error... Has anyone went say 50k on this grind or likewise grind? btw Im saving up for 13.1 pistons and I plan to to do the 2000 rpm break in with moly lube and the recomended oil... any other tips to make these last? I do long trips and eat up miles. All the clearences and cam timing will be spot on and tripple checked.