The 3UR came with a maintenance-free set of hydraulic lifters to make things easy. At higher RPM and power levels however, sometimes they can't keep up. High performance Toyota G heads have traditionally had solid lifters, but unfortunately, the solid lifters from the 2UR-GSE do not work in the 3UR F head engines.
So we've worked with an aftermarket company to develop a custom set specific to the 3UR (not repurposed from other applications) and will be ready to bring to market very soon! These lifters are a 3 piece design, made in a CNC, heat treated, and micropolished. Expert level stuff often found in Italian exotics with forced induction making over 1000 HP!
In the mean time, preorders are open, and we have a picture of Sir Thomas the Third adorning this listing
Lifters include shims, so you can set the lash with your cams and valves