well. ive had this damn noise that i am pretty sure is the lifers. so iam taking off the intakes and i got it all apart except for disconnecting the fuel lines and removing the lower intake and heater hoses. now dont laugh too hard at me, i know a little about cars, but do i have to drain the radiator before going any further? and also how will i know if my lifers are bad and is there any special trick to removing them. thanks in advance.