[Discuss-gnuradio] Bit Sync- Frame Sync Lock indication?

Dear All,

 I have been playing with the Frame sync, Packet-Header blocks recently.

However I could not find any block that has an "FRAME LOCK" indication (when the correct  Header is found).  

Any block, OOT suggestions?

Also I see "Bit Sync" in some Modem HW.

Is there anything like that in GNU Radio receiver blocks?

Thank you in advance.