According to
http://airlineroute.net/2014/01/16/lh-lax-s14/
As per 16JAN14 GDS timetable/inventory display, Lufthansa in Summer 2014 season plans to operate 2 daily Boeing 747-8I service on Frankfurt – Los Angeles route. Summer seasonal 2nd daily LH450/451 service, which operates from 22MAY14 to 25OCT14, is scheduled to be operated by Boeing 747-8I, instead of -400.
LH456 FRA1005 – 1240LAX 74H D
LH450 FRA1405 – 1640LAX 74H D
LH457 LAX1505 – 1050+1FRA 74H D
LH451 LAX1915 – 1500+1FRA 74H D