No luck Adjusting Rockers

You don;t know anything else about it? Different camshaft designs and different lifter types need and like different preloads. That's why I was asking. In terms of "turns", I don;t use that method. I would pull the intake and visually verify and measure the preload. Set it that way, and then record what it needs to be turn wise. Some lifters are may just be noisier, and some blocks have sloppier lifter bores and have issues staying quiet.