I've been running a Comp Cam hydraulic shaft with lifters, pushrods, etc in my rebuilt 198 for over 3 years.. It performs beautifully! I always keep clean oil in the sump and monitor everything carefully, but Chrysler didn't make the change to hydraulic lightly. I believe that it was helpful for emissions at the time, but if it was a big fail for durability or performance they would not have gone forward. Solid lifters are THE ticket for many applications, but after 30 years of wrenching adjusting my valves with the car "running and hot" is something that I'm glad to leave in the rear view mirror. I mostly just drive my cars stoplight to stoplight. ( I DO still adjust the valves on my aluminum slant in the 63.)
