With hyd lifters you will have them pump up at high rpm's. If you run them loose they can pump up more thus you gain a bit more lift.
This is great on a race car but the gain in lift comes with more valve train noise which might not be what one wants for their street car.
Each cam & valve train can be different about how much pre load it will take to give a quiet or at least kinda sorta quiet operation. You just have to try what works best for you and here is one of the benefits of stud mount rockers......ease of & flexable valve adjustments.
Later
Grady
This is great on a race car but the gain in lift comes with more valve train noise which might not be what one wants for their street car.
Each cam & valve train can be different about how much pre load it will take to give a quiet or at least kinda sorta quiet operation. You just have to try what works best for you and here is one of the benefits of stud mount rockers......ease of & flexable valve adjustments.
Later
Grady