Hydraulic cam for slant

IMO, the slant six did not do well with the conversion to hydraulic lifters. They never ran "quite" right and had problems with valve train ticks. I've always felt the reason for that was the fact that the lifters barely get pressurized oil. The slant six oils "backwards" compared to other engines. Oil goes from the block to the head, into the rocker shaft, through the rocker, into the pushrod and finally into the lifter. It's just not a good setup. As mentioned, you cannot just change over to hydraulic. You need the pushrods, rockers and the rocker shaft is even different, not to mention, of course, the camshaft and lifters themselves.