I run my comp cam with 512/512 on L76 springs and stock rockers, it is perfectly fine after 20k....
I know people do it....it's not something I would recommend though.
Just like myself running a stock timing chain with 20k miles on it...10k using LS6 springs, and 10k using 130# springs. I wouldn't recommend that to anyone.
2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
2005 F350 6.0 - studded, deleted, tuned
2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold