Possibly- - - -Powerglde equipped passenger cars ran hydraulics from 1950 on, even on the spray-oiler 235's. By the late 1950's, all the cars ran hydrauilc lifters, standard or automatic. The trucks ran solids, I believe.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!