I pulled my 408 to freshen it up over the winter, my flat solid was starting to go. The motor had been ran hard for five years. When building the motor I burnished the lifter bores, made sure all the lifters rotated, used EDM lifters and broke the cam in properly without the inner springs. I always ran diesel oil with zinc additive too. A few of my lifters looked like part of the bottom had been hit with a tiny needle scaler. I replaced the springs after three years and stayed on top of the valve lash.

My new engine will have a solid roller in it.