true i talked to the tech from crane and he said the only way you should run stock springs and retainers is if they are really fresh.. think of the damage you can have if something fugsup.. if you float a valve you wasted alot of $ ...for nothing.. and my car does idle like a bitch by the way.. but i don't have cam gears or have any tuning yet.. i still notice a real nice difference though.. does anyone know someone with experience tuning these cams??