Picking up a 2014 5.7 in a few days...
Resurrecting an old thread here, time sure does fly. I finally got around to pulling one of the heads on this 5.7 I picked up, lo and behold it's the exact issue
@Cuda SRT8 guessed it would be. The #4 intake lifter roller wheel failed (looks like some needle bearings came out), trashing the lifter and the corresponding cam lobe as well as bending a pushrod. I looked closely at the piston and head for that cylinder and there is no evidence of valve-to-piston contact. Looks like I'll be getting a new cam and lifters.
On the bright side the cylinder bores look great for 130,000 miles, they all still have the crosshatching visible except for around the thrust areas about the size of a quarter coin about 1/3 of the way down and there's no ridge at the tops to speak of. I'll get some pics up in a bit...