hi, how much valve spring pressure is on the heads ? open and closed!! the reason I ask, is , stock stamped rockers don't like a lot of spring pressure.
how much preload on the lifters?
with stock rockers there is really no way of telling what kind of preload there is on any of the lifters being non ajdustable you just torque the shafts and the preload is what ever was designed into them which i think is little to none when the lifter is on the bottom of the cam lobe with stock rockers you can wiggle the rocker back and forth a bit