Im about to adjust the valve lash on my b20a... not b20a5.... are there any thing i should be careful not to mess up while im in there...and also, are the rockers suppose to be loose??... cause mine are. they wiggle back and forth when not being pressed down bye the cams. I think that they are makin a hell of a lot of noise... what can be done to stop this? thanx for your help.