You know as well as anyone here that very few of the companies selling lifters actually manufacture them, and I'm pretty sure you know all about private labeling, why should FM be any different than anyone else??
It is entirely possible that FM has their lifters manufactured to their specs, but it's also just as likely that they, or others, are re-boxing TRW Chevy lifters, with or without the knowledge of the actual manufacturer.
There's nothing to stop me from calling up Summit Racing, buying sets of lifters(Comp Cams, Crane, TRW etc) and then re-selling them in new boxes with my catchy name printed on them. For that matter, if I want to be even more impressive I can even have my catchy name laser engraved on those very same lifters and sell them for even more money.
Is FM different than anyone else, or am I missing something??