I is easy to tell if it is a cracked rocker all you need to do is take the rocker cover off and take a look.
The rockers are pretty well made so it is unlikely a rocker. I would look at the lifter or the pushrods first.
I have heard of Fueling lifters having problems.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.