I was thinking of going driveline billet head or the stealth one, with a driveline stock length crank but my mechanic buddy and you guys told me to go oem so ima do that a track down one,unless I hear good reviews about driveline crank, I spoke to lane today and he told me the cranks are up to par or better than any other crank in the market,he also said the 8 koyo bearing are the best bearing with the most reliability on the market.I was thinking of getting the billet head but I can’t lie the stealth stock head looks nice to.anybody used there heads, how are there coolant passages?