just got it!
First they replaced #4 cylinder head/valve but light showed up again that indicated #5 misfire. so they replaced it too.
they said replaced both left and right side cylinder head. I guess #4 is left and #5 is right side cylinder head?
anyway, obviously can feel difference after fix it.
BEFORE
turn on engine, I can hear and feel some explosion from engine. and car shacked.
obvious 'tick' sound from driver side.
AFTER
so smooth when I turn on engine. no shock and sound from engine.
no 'tick' sound just normal engine sound.
now I'm ready to do re-gear at EVO next wednesday!!