All i know is that when i would pull my valve cover off the next day, valves that were on there lobes had collapsed. Ss in, the lift at the spring had been reduced. NOT that the valve train was loose, just that the spring pressure was reduced.
No clatter at start up...........which is why i made my statement above.
And these were Mother Mopar Hyd Lifters of 10 years ago.
I've had the valve covers off and after turning off the motor I can watch the lifters bleed off of a lifted valve with a dial indicator after several minutes. Comp hydro flat lifters with an xe268h. No lifter tick at all and the 318 goes like hell.