Originally Posted by Docpsycho
so what keeps solid lifters from the valves hitting the pistons,& bending some valves and push rods?
The lash of solid lifters and the pre-load of hydraulic lifters are set with the lifters on the heel (base circle) of the cam lobes with the valves seated.
If a hydraulic lifter is full of oil and has a hydraulic lock, the push rod seat will remain at the the top of the lifter travel when the lifter is on the heel of the cam lobe. When that occurs, the valve will be held off the seat by the amount of the rocker ratio x half the lifter travel (pre-load).